U1101 Code - Engine-A/T-ECU Time-out
Quick Answer
The combination meter receives transmission control system-related signal from the engine-A/T-ECU via CAN bus lines. Common causes include Faulty Engine-A/T-ECU, Engine-A/T-ECU harness is open or shorted, Engine-A/T-ECU circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- U1101 indicates Engine-A/T-ECU Time-out.
- Common causes
- Common causes include Faulty Engine-A/T-ECU, Engine-A/T-ECU harness is open or shorted, Engine-A/T-ECU circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code U1101 Description
What are the Possible Causes of the DTC U1101?
- Faulty Engine-A/T-ECU
- Engine-A/T-ECU harness is open or shorted
- Engine-A/T-ECU circuit poor electrical connection
- Faulty combination meter
How to Fix the DTC U1101?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the U1101 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the U1101 code?
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Need Help with the Code?
Get the U1101 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- U1101 Chrysler — Lost Communication With PST Display
- U1101 Dodge — Lost Communication With PST Display
- U1101 Jeep — Lost Communication With PST Display
- U1101 Lexus — Lost Communication With Distance Control ECU
- U1101 Mitsubishi — Engine-A/T-ECU Time-out
- U1101 RAM — Lost Communication With PST Display
- U1101 Scion — Lost Communication With Distance Control ECU
- U1101 Toyota — Lost Communication With Distance Control ECU
Frequently Asked Questions about U1101 Code
1. What are the common symptoms of OBDII code U1101 (Engine-A/T-ECU Time-out)?
- Common symptoms include intermittent or constant illumination of the Check Engine Light, rough idling, poor acceleration, and transmission shifting issues.
2. What are the possible causes of OBDII code U1101?
- The code U1101 can be triggered by issues such as a faulty Engine Control Module (ECM), Transmission Control Module (TCM), wiring problems, or a communication error between the ECM and TCM.
3. How can I diagnose the OBDII code U1101?
- Diagnosis typically involves using a scan tool to retrieve the code, checking for other related codes, inspecting the wiring harness for damage, and testing the communication between the ECM and TCM.
4. Can a DIYer repair OBDII code U1101?
- Repairing U1101 may require advanced diagnostic skills and tools, so it is recommended to consult a professional mechanic for proper diagnosis and repair.
5. Are there any quick fixes for OBDII code U1101?
- Quick fixes like resetting the code using a scan tool may temporarily turn off the Check Engine Light, but the underlying issue will persist and should be properly addressed.
6. Is it safe to continue driving with OBDII code U1101 present?
- It is not recommended to drive with the U1101 code active, as it can lead to further damage to the engine or transmission if left unresolved.
7. How much does it cost to repair OBDII code U1101?
- Repair costs for U1101 can vary depending on the exact cause of the issue, but expect to pay for diagnostic time, parts replacement, and labor fees.
8. Can a low battery voltage trigger OBDII code U1101?
- Yes, a low battery voltage can cause communication issues between the ECM and TCM, leading to the U1101 code being triggered.
9. Will resetting the code make it go away permanently?
- Resetting the code without addressing the underlying issue will only temporarily turn off the Check Engine Light. The code will likely return until the root cause is fixed.
10. How do I prevent OBDII code U1101 from coming back?
- To prevent the U1101 code from returning, it is essential to address any underlying issues promptly, perform regular maintenance on the vehicle, and keep the ECM and TCM well-maintained.
Discuss the causes and fixes for U1101 OBDII Code
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The U1101 is a communication error, and most of the times is a wire problem. What make, model and year is your vehicle?
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I have a mitsubishi L20 k/cab warriior DHD, engine light comes on then it becomes sluggish, Faultcodes that are in truck are U1101 & also P0106 comes back in every so often not all the time.. Has anyone got any ideas please.
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What yera is your truck?
The sluggish it's probably more related to the P0106 code.
Read more here: https://www.autocodes.com/p01...
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code P3400 , U1101: 2009 HONDA PILOT EXL AWD, ENGINE VIBRATES, CHECK ENGINE AND VTM4 LIGHTS ON ONCE IT REACHES 30 MILES/HOUR. 2009~2013 HONDA PILOT HAS PROBLEMS IN ROCKER ARM PRESSURE SWITCHES SO I HAVE REPLACED BOTH OF THEM BY MY SELF (VERY EASY TO REPLACE PARTS COST ME $45.00 BOTH). CHECK ENGINE LIGHTS GONE NO VTM4 LIGHTS ON , BUT STILL U1101 CODE IN THERE. ENGINE STILL CAUSING VIBRATION ONCE REACHES 30 M/H. IF SOME ONE KNOWS HOW TO FIX THIS VIBRATION (IT OCCURS ONCE IT SWITCHES TO VCM MODE (CHANGES FROM 6 CYL TO 4- CYL).
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Sounds like only one side it;s changing. You may have clogged oil passage. Try using a different weight of oi and/or and oil additive (the type of oil additive that cleans the engine).
P3400 Honda - Valve Pause System Stuck Off Bank 1
Read more: https://www.autocodes.com/p34...
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I have that code coming up on my L200 and it doesn't want to reset.. does anyone have a diagram or can give me any information on it?
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