U1426 RAM Code - Implausible TCC Slip Request Signal Received
Quick Answer
The Diagnostic Trouble Code (DTC) sets when the Transmission Control Module (TCM) receives an implausible Torque Converter Clutch (TCC) slip request Electronically-Modulated Converter Clutch (EMCC) from the Powertrain Control Module (PCM). Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted, Transmission Control Module 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
- U1426 RAM indicates Implausible TCC Slip Request Signal Received.
- Common causes
- Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted, Transmission Control Module 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 U1426 RAM Description
What are the Possible Causes of the DTC U1426 RAM?
- Faulty Transmission Control Module (TCM)
- Transmission Control Module harness is open or shorted
- Transmission Control Module circuit poor electrical connection
- Faulty Powertrain Control Module (PCM)
How to Fix the DTC U1426 RAM?
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 U1426 RAM 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.
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Frequently Asked Questions about U1426 RAM Code
1. What does the OBD-II code U1426 mean?
The code U1426 indicates that the powertrain control module (PCM) has detected an implausible signal related to the torque converter clutch (TCC) slip request in a RAM vehicle.
2. What are the common symptoms of code U1426?
Symptoms may include poor fuel efficiency, transmission slipping, difficulty shifting gears, or the check engine light being illuminated.
3. What causes the U1426 code to appear?
Common causes include a faulty torque converter clutch solenoid, transmission fluid issues, a malfunctioning PCM, or damaged wiring and connectors in the transmission system.
4. Can driving with code U1426 cause further damage?
Yes, ignoring this code can lead to transmission overheating, severe internal damage, and reduced overall vehicle performance.
5. How do I diagnose the U1426 code?
Start by using an OBD-II scanner to confirm the code, then inspect the TCC solenoid, transmission fluid level and condition, and check for damaged or corroded wiring and connectors.
6. What is the torque converter clutch (TCC)?
The TCC is a component in the transmission that helps improve fuel efficiency by locking the torque converter to eliminate slippage during specific driving conditions.
7. Can low transmission fluid cause the U1426 code?
Yes, low or contaminated transmission fluid can affect TCC operation and cause the PCM to detect an implausible slip signal.
8. How is the U1426 code fixed?
Repairs may include replacing a faulty TCC solenoid, fixing damaged wiring, topping off or replacing transmission fluid, or reprogramming or replacing the PCM if needed.
9. Is a professional mechanic required to fix code U1426?
While some basic checks like inspecting and replacing transmission fluid can be done by a DIYer, diagnosing and repairing the TCC system or PCM usually requires professional expertise.
10. Can a software update resolve the U1426 code?
In some cases, a PCM software update from the manufacturer can address communication or calibration issues related to the TCC signal.
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