Torque Management Request Input Signal Low
The P2546 code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition on the torque management request input signal circuit. This signal is used by the PCM to reduce engine torque in response to requests from other modules, such as the transmission control module or stability control system. A low voltage reading suggests a short to ground, open circuit, or faulty sensor/module, which can prevent proper torque reduction and affect drivability.
01. Most Common Causes
- Faulty torque management request sensor or module
- Short to ground in the signal circuit
- Open or damaged wiring/connectors
- Corroded or loose electrical connections
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Harsh or delayed transmission shifts
- Poor acceleration or hesitation
- Stability control or traction control warning lights
03. Step-by-Step Diagnosis
Step 1: Connect a scan tool and retrieve all stored codes and freeze frame data.
Step 2: Visually inspect the wiring and connectors related to the torque management request circuit for damage, corrosion, or loose connections.
Step 3: Use a multimeter to test the signal circuit voltage at the sensor/module and PCM; compare with manufacturer specifications.
Step 4: Check for shorts to ground or opens in the circuit by disconnecting the sensor and PCM and measuring resistance.
Step 5: If wiring is intact, test the torque management request sensor/module per service manual procedures.
Step 6: If all components test OK, consider PCM reprogramming or replacement as a last resort.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can cause reduced engine power, poor transmission shifting, and potential safety issues. Have the vehicle diagnosed and repaired promptly.
How much does it cost to fix?▼
The cost to fix P2546 typically ranges from $150 to $400, depending on the root cause. Wiring repairs are cheaper, while sensor/module replacement or PCM work can be more expensive.