What Does P2644 Mean?
The PCM has detected an abnormally high voltage signal from torque management feedback circuit B. This indicates the feedback signal exceeds the acceptable maximum threshold, pointing to a wiring or component fault.
Common Causes
40%
Wiring harness short to voltage or damaged insulation contacting power source
25%
Failed transmission pressure sensor with internal short providing excessive voltage
20%
Defective transmission control module with internal voltage regulation failure
10%
Open or damaged ground circuit causing signal voltage to rise to reference voltage
5%
PCM internal circuit fault or damaged input circuitry
Diagnostic Steps
1
Step 1: Inspect all wiring for torque feedback circuit B, looking for evidence of chafing, melting, or contact with hot exhaust components
2
Step 2: Disconnect the torque feedback sensor/switch at the transmission and measure voltage at the PCM connector; voltage should drop to near zero
3
Step 3: Check for voltage on the signal circuit with sensor disconnected; any voltage present indicates a short to power in the harness
4
Step 4: Test transmission pressure sensors for proper resistance and voltage output according to manufacturer specifications
5
Step 5: Verify proper operation of TCM by checking voltage supply and ground circuits; test for internal short conditions
Estimated Repair Cost
$150 - $1,500
Parts + labor, varies by vehicle and location
The PCM has detected an abnormally high voltage signal from torque management feedback circuit B. This indicates the feedback signal exceeds the acceptable maximum threshold, pointing to a wiring or component fault.
The most common cause of P2644 (Torque Management Feedback Signal "B" High) is: Wiring harness short to voltage or damaged insulation contacting power source
Typical repair costs for P2644 range from $150 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May cause transmission to operate in fail-safe mode with harsh shifts or limited gear selection. Safe to drive carefully but repair soon to prevent transmission damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2644 to identify the root cause.
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Quick Info
Category
Powertrain
System
Torque Management / Transmission Control
Difficulty
Type
Generic (SAE)
Recommended Tools
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