U1400 RAM Code - Implausible TPS Signal Received
Quick Answer
The purpose of the diagnostic is to monitor the Controller Area Network (CAN) BUS, the transmitted messages on the CAN BUS and the validity of the CAN signals. Common causes include Check for Powertrain Control Module (PCM) codes, Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted. 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
- U1400 RAM indicates Implausible TPS Signal Received.
- Common causes
- Common causes include Check for Powertrain Control Module (PCM) codes, Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted.
- 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 U1400 RAM Description
What are the Possible Causes of the DTC U1400 RAM?
- Check for Powertrain Control Module (PCM) codes
- Faulty Transmission Control Module (TCM)
- Transmission Control Module harness is open or shorted
- Transmission Control Module circuit poor electrical connection
How to Fix the DTC U1400 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 U1400 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 U1400 RAM Code
1. What does OBDII code U1400 mean on a RAM vehicle?
U1400 indicates that the vehicle's modules have detected an implausible signal from the Throttle Position Sensor (TPS).
2. What are common symptoms of code U1400 in a RAM vehicle?
Symptoms may include a check engine light, poor throttle response, reduced engine power, or rough idling.
3. What causes the U1400 code to appear?
Common causes include a malfunctioning Throttle Position Sensor (TPS), wiring issues, a faulty PCM (Powertrain Control Module), or corroded electrical connections.
4. Can a dirty throttle body cause the U1400 code?
Yes, excessive dirt on the throttle body can interfere with the TPS readings, potentially triggering the U1400 code.
5. How is the U1400 code diagnosed?
A technician will typically check the TPS for proper operation, inspect the wiring and connectors for damage, and use a scan tool to confirm the signal data from the TPS.
6. Can I drive my RAM with the U1400 code active?
While the vehicle may still be drivable, it’s not recommended as it could lead to further damage or unsafe driving conditions due to unstable throttle response.
7. How do I fix the U1400 code on my RAM?
Repairs may involve cleaning or replacing the TPS, fixing damaged wiring or connectors, or reprogramming or replacing the PCM if needed.
8. Is the U1400 code specific to RAM vehicles?
The U1400 code is commonly seen in RAM vehicles but can also appear in other vehicles using similar systems.
9. How much does it cost to repair the U1400 code?
The cost varies depending on the issue but typically ranges from $100 to $400, depending on whether the TPS, wiring, or PCM needs repair or replacement.
10. Can a software update fix the U1400 code?
In some cases, a software update for the PCM may resolve the issue if it’s related to miscommunication between modules.
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