What Does P2546 Mean?
The torque management request input signal voltage is below the minimum acceptable threshold. The PCM detects a low voltage condition on the torque request circuit from the requesting control module.
Common Causes
35%
Short to ground in torque request signal circuit wiring
30%
Failed TCM output driver circuit pulling signal low
20%
Damaged or corroded control module connector causing poor signal
10%
Ground fault in CAN bus or dedicated signal circuit
5%
PCM input circuit failure internally shorted
Diagnostic Steps
1
Step 1: Inspect all control module connectors for corrosion, bent pins, or moisture intrusion
2
Step 2: Measure voltage on torque request signal circuit at PCM connector with key on
3
Step 3: Check for short to ground on signal circuit with modules disconnected using ohmmeter
4
Step 4: Monitor signal circuit with oscilloscope if available to check for proper signal integrity
5
Step 5: If wiring tests good, test TCM output capability or replace module as needed
Estimated Repair Cost
$150 - $1,800
Parts + labor, varies by vehicle and location
The torque management request input signal voltage is below the minimum acceptable threshold. The PCM detects a low voltage condition on the torque request circuit from the requesting control module.
The most common cause of P2546 (Torque Management Request Input Signal "A" Low) is: Short to ground in torque request signal circuit wiring
Typical repair costs for P2546 range from $150 to $1,800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Loss of torque management can cause harsh shifts and potential driveline shock. Safe to drive with caution but may experience uncomfortable shift quality.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2546 to identify the root cause.
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Quick Info
Category
Powertrain
System
Powertrain Communication/Transmission Control
Difficulty
Type
Generic (SAE)
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