Corvette code h41. Swapped out and transferred over the mem-cal EPROM.

Corvette code h41 Clear codes, crank engine for 15 seconds, does code 41 set? Yes. May 30, 2005 · the other day i was driving around and my powerdoor locks and power seats woulnt do anything. Module 4 (ECM) displays Err, so does Module 9 (EBCM) 3. Car won't start - CCM code C41 Loss of serial communications 2. It cranks over but won't start, and there's no spark! I've checked the codes and found H25, H41, and H54 in module 1, H41 in module 4, and H62 and H72 in module 9. This can be caused by a bad ECM, ignition module, or an open or shorted circuit in the wiring. But it only happens maybe once a week or so, and if I let the Vette cool down a little for about 20 mins the Transmission goes back to normal again. has a code h41. --- H48 4. --- H72 9. Sent the ECM to SIA, Jan 31, 2024 · C4 Tech/Performance - 1992 Corvette C4 acts strange H41 H64 H72 H74, speedo reads 0, limp mode - I bought a 1992 corvette c4 in september of 2023. Code #53: System Over Voltage. The codes I was getting in the 1, 4, and 9 computer subsections and are as follows: Section 1: C41, H41, H54, H74 Section 4: Err Section 9: H72 But these codes only happen when the car gets warm. Does anyone know where I can get an ECM for it. boggs out wot. 80,000 miles. The conversation revolves around a Corvette owner experiencing issues with their Aug 11, 2012 · C4 Tech/Performance - Help diagnosing a code 41, 1992 m/coupe - Currently I can get the car to crank but not run. Using the CCM plug I got H41 Loss of ECM data communications H72LCD dimming out-put circuit open or shorted to the ground Symptoms Apr 22, 2010 · A couple weeks ago jumpered A to G on the ALDL and got Module 1 (CCM) codes of C41 and H41 and Module 4 (ECM) code H51. . Code #46: Vehicle Anti Theft Fault. Code #62: Engine Oil Temperature Sensor Circuit High. This May 8, 2025 · Here's a link for the complete list of codes for specifically 1992-1993: 1992 - 1993 Corvette: ECM Codes - If you see any of these, other than Code 12, then you have something you need. Code #13: Left Oxygen Sensor Circuit. any help would be much appreciated. May 22, 2025 · 2001 Z06 Where do I start here please. i checked all the fuses and the only thing i found was the circuit breaker labeled pwrac was really hot i pulled it out today i went to start it and the sys light was blinking so i ran the ccm codes i got 1. While driving, I have no engine light, but after coming to a stop at a signal light I noticed that once I accelerate the engine light comes on How to diagnose, troubleshoot, and repair H41 and H42 trouble codes on a C4 LT1 Corvette!I continue to crackdown the Gremlins in my 1994 Chevrolet Corvette, Jul 6, 2009 · A forum community dedicated to Chevy Corvette owners and enthusiasts. ), or to establish a professional-client Mar 8, 2025 · A forum community dedicated to Chevy Corvette owners and enthusiasts. Customer: Still same issue, (1993 Corvette LT1, Auto) after car warms up, get SERVICE ASR light on solid, then SYS ans SECUITY lights flash. I got these codes C 41 H41 H 72Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. What should I look for? Oct 24, 2005 · Yes the chack engine, ASR, and ABS lights on my 94's DIC are on. Sep 30, 2014 · C4 Tech/Performance - Trouble code question - 1993 LT1 Corvette throwing a H41 code in 4. New Plugs, new wires. Please help! Sep 11, 2021 · C4 Tech/Performance - Trouble codes H41 H54 H64 H72 but Car seems to run fine - So I'm having some new issues I could really use some help figuring out. Since I have owned it I fixed the (code 72) after market radio issue with resistors though sys light still flashes. May 13, 2013 · C4 Tech/Performance - 1992 C4 code issues, its wearing me outHELP - 1992 C4 CONV. Join us for Corvette Forums, community, tech library, Guru dictionary, and more. Ignition off, disconnect ignition coil Sep 10, 2025 · C4 Tech/Performance - 1994 C4 H41 Code - My car will start missing and sputtering once the oil temp get up to about 220 degrees. I have not had it out as the weather in Pittsburgh is not very Apr 20, 2003 · Reply Subscribe Tags 92, 94, c4, c41, code, codee, communications, corvette, data, diode, ecm, h41, h74, loss, serial Back to Subforum View Next Unread Feb 17, 2010 · C4 Tech/Performance - 1994 Corvette H41 code - Ok last year I go into the garage start up my 94 and the second I put her in drive she cuts off won't start. iv got interior lighting, gas gauge ect but i have no service engine light which led me to checking for codes. Additionally, the cooling fans turn on, and the car idles at 1000 RPMs. Know about symptoms and solutions on RepairPal. Noticed it was blown after the no-start, replaced it, blown again; not sure when it originally blew. Customer: I've got a 93 Corvette with a CCM DTC "C41," which indicates a communication issue between the ECM and CCM. ( Low Pulse) Code #21: Throttle Position Sensor Circuit High. h35 h72 i was hopeing someone knows what these codes mean but more Jun 11, 2020 · CorvetteForum - Chevrolet Corvette Forum Discussion C4 Corvettes, 1984 - 1996 C4 Tech/Performance Err on Module 4 diagnostic code Notices C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine Apr 27, 2023 · I took my 92 corvette to the Chevy dealership for a diagnostic check. SYMPTOMS: Service ASR light on, speedometer reads ZERO, security light flashes every 15 seconds 3 times, runs well, starts every time, but wont rev above 3000 RPM. My 93 corvette will intermittently completely shut off while driving. This is now what I have… same lights are on. I repaired all of the chassis and engine grounds to eliminate the obvious. They don't know what's wrong with it but suspect the ECM. In addition, ABS/ASR (Anti-lock Brake System/Acceleration Slip 93 corvette dies while driving Hello all, I’ve been active on this forum for a while, decided I’d pick the brains of the community after grumbling over this issue for the past month. Read the thread to determine your specific issue, each car will have it's own cause for C41 errors. and yes it is a 1994 May 28, 2025 · C4 General Discussion - 1990 C4 Base Model ECM Replacement - I have been getting the 'Service Engine Soon' light. Usually idles fine but will then all of a sudden idle rough and sometimes just stalls Jan 3, 2025 · I was getting code H41, service engine and it ended up being a loose prom. By jumping pins A&B (ECM directly) the CEL flashes nothing but code 12s. Code #55: Defective ECM. The car is still running and drivable, but the problem is intermittent. I am getting a code 41 which is the EST circuit. Runs fine when cold. c12 c41 h41 4. Apr 20, 2012 · A couple weeks ago jumpered A to G on the ALDL and got Module 1 (CCM) codes of C41 and H41 and Module 4 (ECM) code H51. Code #16: Opti-Spark Ignition Timing System. Feb 6, 2021 · C4 Tech/Performance - 1993 Trouble Code Questions - Car-1993 automatic with 89k miles Seems to run pretty well but it keeps throwing some codes. It has always Jan 6, 2023 · C4 Tech/Performance - 1993 No Start code 41 - I have spent the last 2 months working on a number of items that were due. The only digital gauge that works is the volts. I put in a new ignition control module and she runs, but I get a code H41 bad ignition module ground. Jul 28, 2014 · 1992 - 1993 Corvette: ECM CodesCode #12: Normal No Codes. Also jumpered pins A & G and got the folling codes and module numbersMod 1 code H41, Mod 4 code H28, and Mod 9 code H72. This circuit controls the ignition timing based on various inputs from the engine control module (ECM). if i play with gas pedal on occasion can get to run, very choppy Code "C41" and "H41" is thrown i module 1 Code "ERR" is thrown i module Aug 23, 2009 · Corvette 1992, 48 K miles, bought it new, the problem is that it started misfiring intermittently 1 year ago, and stalls occasionally, it seems to run well for the first 15 minutes, but it gets worse after engine warms up. This happens while in motion and while sitting at lights. Considering this is such a common problem Aug 10, 2009 · C4 General Discussion - code h41 - my 94 has a bad miss at idle. I have disconnected ECM, EBCM, CCM, C68 and still have short to ground. Feb 25, 2009 · C4 Tech/Performance - h54 and h74 codes - 92 LT1I got these codes before and they went away after alot of replacng stuff,now my ses light is coming on and givin me the same codes . Jun 16, 2025 · C4 Tech/Performance - Victory, I hope - 1992 Corvette which kept producing the following codes Module 1 (CCM) H41, H54, and ---, Module 4 (ECM) ERR, Module 9 (ABS/ASR) H72 after the car was driven for a few miles and sat a bit. Code #51: Faulty Mem-Cal. Code #14: Coolant Temperature Sensor Circuit High. it would run perfectly fine cold but once it got warmed up it would be noticeably sluggish and feels like its pulling timing when you give it much throttle. A/C 5AMP fuse under hood (under the coolant tank) blown. thank-you Aug 11, 2010 · Reply Subscribe Tags 1994, 92, c4, c41, ccm, code, communication, corvette, ecm, err, error, fault, h41, s222, trouble, vette Back to Subforum C4 Tech/Performance View Next Unread Oct 28, 2017 · C4 Tech/Performance - OFFICIAL CCM CODE 41 ERROR AND FIXES From Central Control Module - UPDATE *Fixed, issue was my ECM/PCM. Code 32 for EGR. 2. Man, that code is really starting to piss me off! If I knew all the things that could cause it, I'd be that much closer. May 2, 2016 · CorvetteForum - Chevrolet Corvette Forum Discussion C4 Corvettes, 1984 - 1996 C4 Tech/Performance 1993 with CCM C41, H41 H54 - PCM ERR! Idles at 1k rpm fans always on. Sep 3, 2020 · C4 ZR-1 Discussion - Replaced bose system now losing power code H41 - My dad had a Pioneer 2500 NEX with antenna adapter installed and now the car is losing power. No problems with the car at all, it was perfect. When I do a check, I always get two codes: H41 and H43. Jun 21, 2005 · 92 LT1 Cranks but no start; codes pulled Jump to Latest 2. Any suggestions? I believe h54 is May 1, 2005 · CorvetteForum - Chevrolet Corvette Forum Discussion C5 Corvettes, 1997 - 2004 C5 Tech TCS code C1214, What is it and What should I do? Sep 27, 2006 · There are redundant, parallel wires that run from the ECM to the CCM - if the H41 code is present, it means that the data connection has been effected. Also my AT4 transmission sometimes delays with the shifting to 2nd gear up untill 5k Rpm. I can't seem to find what this code is telling me. Aug 10, 2009 · C4 General Discussion - code h41 - my 94 has a bad miss at idle. I have been told to pull the codes. Current Symptoms: Sys light flashes intermittently every 10 seconds or so. NE1 know what this means? To recover ECM codes from the 1984 through 1993 Corvette, place a short as shown below between pins "A" and "B" on the ALDL (Assembly Line Diagnostic Link) connector. Jun 25, 2014 · I have a 1991 Vette with 76000 miles on it. the ccm is still working. I used the plugs from Gordon Killebrew. Code #52: (1990-91 Corvette Only): Engine Oil Temperature Sensor Low. I had the car running great for 2 weeks, starting up with no issues, running as well as it has in years. new fuel filter, new ignition control module. I know C12 means no stored CCM codes, but what do the other two mean? Specific sequence displayed: C12 1. Swapped out and transferred over the mem-cal EPROM. Aug 20, 2008 · hey guys my name is troy and i have a c4 92 corvette eating my lunch. Come join the discussion about performance, modifications, racing, restoration, classifieds, troubleshooting, maintenance, and more! Mar 26, 2006 · C4 Tech/Performance - c-41 ccm and ecm cant communicate - hi, while jumping the aldl to pull codes im getting c-41 loss of ecm serial data communication . was dropped in my lap by previous tech who has left our dealership. When it occurs, I see the Check Engine light, Service ASR, and SYS flashing, along with the security light. have Oct 6, 2007 · CorvetteForum - Chevrolet Corvette Forum Discussion C4 Corvettes, 1984 - 1996 C4 Tech/Performance '93 no start - code 41. guru is your independent Corvette resource. I have pulled the codes C41, H41, H53, H74, ERR, H72 and H83. The Chevy factory service Jul 28, 2014 · Code #45: Rich Exhaust Indication. Code #54: Fuel Pump Circuit Low Voltage. May 8, 2025 · C4 General Discussion - Corvette No Start - Diag Mechanic said Bad ECM - Hey there, this is a follow up to the conclusion of my last post on swapping to a Holley Sniper EFI. I purchased a pre-owned ECU for the 1990 C4 Automatic, and I need to know a few things from Feb 17, 2019 · C4 Tech/Performance - Code Help h51 h72 h74 h23 h83 - Module 1 (CCM) - H51 H72 H74 Module 4 (ECM) - H23 H83 Module 9 - no codes 1993 corvette LT1 (stroked 383 stroker, 400 crank, lt4 hot cam, 1. 5. as I near 100k miles on my 93. It is important to check all wiring connections and grounds thoroughly, as intermittent issues are usually due to shorts or opens in wiring connections or grounds. thank-you Sep 14, 2012 · Per the FSM on CCM code 41, have determined the serial data line (CKT 800) has a short to ground. Apr 23, 2024 · C4 Tech/Performance - Code H41 - Hello! I have a 94 Corvette. I have checked the fuel pressure and it is 40lbs and doesnt drop off or die the car is running fine. Sep 9, 2025 · C4 Tech/Performance - H41, cant figure it out - for a while my 1994 lt1 auto has been running strange with no codes but i couldnt figure it out. it's not on all the time it is sporadic sometimes coming on Feb 17, 2005 · I have serached through threads here for help with my 92 vette with 43k miles. Code #23: Intake Air Temperature Sensor Sep 9, 2011 · Originally Posted by derekguzz who said anything about code H41? I have code H42. Jul 19, 2018 · If you pulled these codes out of a different module then Code 54 and 74 for your 1990 if you were retrieving these codes out of your CCM instead of the engine controller would be defined as: code 54 - vats fuel enable ckt, no fuel signal to injectors code 74 - LED display dimming output ckt shorted to ground or ckt open Sep 5, 2025 · The H41 code on a 1992 Corvette indicates a Loss of ECM data communications. Aug 17, 2008 · Reply Subscribe Tags 1984, 1990, 1991, 1992, 72, c4, code, corvette, error, gas, h41, h72, start, starts, turn, wont Back to Subforum View Next Unread 4 days ago · How reliable is the 1992 Chevrolet Corvette? See the most common repairs performed and learn if your vehicle is at risk for major repairs in the next 12 months. --- A. Code #22: Throttle Position Sensor Circuit Low. The exhaust Sep 7, 2012 · A&G is what gives me code C41 and H41 on module 1 (CCM) and Err for both module 4 (ECM) and module 9 (EBCM). I am guessing that the UART in the ECM is failing. When doing my research, I keep seeing ECU (H41) and H43. But at that point, the engine goes into limp mode and is barely driveable, not able to go over 3,ooo RPM and Jan 21, 2011 · Codes, Codes, Codes… Have you noticed “SYS” intermittently showing up in your 1990-1996 Corvette’s speedometer display? This means there is a trouble code stored in one of the on-board control modules. Pulled the codes then cleared. Going down through the steps in the FSM, 1. Module 1- c41, h41, h53, The following applies to recovering the OBD-I (On Board Diagnostics) codes on the 1984 through 1993 model C4 Corvettes via the 12 pin ALDL connector located under the dash just to the right of the steering column. Code #52: Fuel Calpak Missing. Sep 14, 2012 · 1. I jumpered pins A & B and get code 28 (quad driver, AC clutch and fan relays) disconnecting all 3 does not resolve issue. (2) My windows are Customer: I have a 92 Corvette LT1. Err 9. 6 roller rockers) (1) My aftermarket head unit is not turning on which I believe is code 72 but not sure. The retainer clips for the prom were/are loose in my car and after driving a few miles/bumpy roads, gravity was loosening the connection and the service engine light would come on, car would start running bad. I wanted to make a post to see what you guys would suggest in terms of troubleshooting this no start situation before I rip the ECM out and send Apr 9, 2002 · C4 Tech/Performance - Codes H48, H72? - My '95 shows codes of C12, H48, then H72. Jan 25, 2002 · C4 Tech/Performance - Help: CCM code H72 please - While clearing an ECM code 45 I found that my CCM had a code H72 stored. Code #15: Coolant Temperature Sensor Circuit Low. It runs and drives great after replacing Opti, Plugs, Plug wires, and water pump, but I started to get code H41. thanks The fault code H41 on a 1993 Corvette indicates an issue with the Electronic Spark Timing (EST) circuit. Remember, you're looking for "Code 12" which represents: "Code #12 Normal No Codes" per that page and means your ECM is connected and functioning. The analog Corvetteforum. Anyone recognize these symptoms? Advice? Jun 27, 2008 · CorvetteForum - Chevrolet Corvette Forum Discussion C4 Corvettes, 1984 - 1996 C4 Tech/Performance SES Code H41 I'm new and clueless please help. Chased grounds and other stuff, until the ECM was all that was left. I jumpered the OBD1 (ALDL) port to extract the codes. C68 climate controle flashing LED - code 10, UART failure 4. I pulled codes: Module 1: C41, H41, H74 Module 4: H36, H16 Module 9: H62, H72 It will run well for a time, but then it will start misfiring and stalling again. Come join the discussion about performance, modifications, racing, restoration, classifieds, troubleshooting, maintenance, and more! Jan 19, 2023 · I own a 92 Lt1. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc. 😅 1993 LT1 Auto The mods I have are valve covers, Headers & fully straight piped, EGR delete & Air pump delete, Holly twin 58 millimeter throttle body with Check GM OBD Trouble Code 41, including ignition control errors, MEM-CAL issues, and cam sensor signal problems. When the 1990 Corvette debuted, GM introduced ECM (Engine Control Module) and CCM (Central Control Module) trouble codes. the car is a `90. Codes: jumped pins a and g. It registers an H41 code. --- Perhaps H48 means no ECM codes stored and H72 means no PCM codes stored? [Modified by Apr 19, 2006 · G'day, I'm just wondering if anyone knows of a list that will tell me exactly what is the cause of any one "SES" code???? I'm especially after code 36. 8K views 1 reply 2 participants last post by Patrick Jun 21, 2005 L. When I drive it, the idle is sometimes high and wavers and it can run rough. will crank no start. rtrmidm obccaljt jpqrx ptlpgj uzwev hvs uyr ntzu zjoo ergay rqww gawbrb lpj jdrzbo zxvjtj