What Does P0902 Mean?
The TCM/PCM has detected that the clutch actuator circuit voltage is below the expected threshold. This code applies to automated manual transmissions (AMT) where the clutch is electronically controlled rather than operated by a foot pedal. The low voltage condition indicates a potential short to ground, open circuit, or failed actuator motor in the clutch engagement system.
Safety Warning
The vehicle may not be able to engage or disengage the clutch properly, leading to inability to shift gears or unexpected stalling. Do not drive; have the vehicle towed to a shop.
Common Causes
35%
Clutch actuator motor failure or internal short to ground
30%
Damaged or corroded wiring harness between TCM and clutch actuator
20%
Failed TCM clutch actuator driver circuit
15%
Poor ground connection at clutch actuator or TCM
Diagnostic Steps
1
Step 1: Using a DVOM, measure voltage at the clutch actuator connector with key on engine off — expect battery voltage on the supply pin; less than 1V indicates a wiring or fuse issue.
2
Step 2: Disconnect the clutch actuator connector and measure resistance across the actuator motor windings — typical range is 2-15 ohms depending on manufacturer; out of range indicates a failed motor.
3
Step 3: Check for continuity and shorts to ground on both signal wires from the TCM to the clutch actuator — resistance to ground should be infinite (OL on meter).
4
Step 4: Inspect the clutch actuator connector for corrosion, bent pins, or moisture intrusion; clean and apply dielectric grease if contamination is found.
5
Step 5: If wiring and actuator test good, use a bidirectional scan tool to command the clutch actuator and monitor the TCM's response — failure to respond indicates a TCM driver fault.
Estimated Repair Cost
$200 - $1,500
Parts + labor, varies by vehicle and location
The TCM/PCM has detected that the clutch actuator circuit voltage is below the expected threshold. This code applies to automated manual transmissions (AMT) where the clutch is electronically controlled rather than operated by a foot pedal. The low voltage condition indicates a potential short to gr...
The most common cause of P0902 (Clutch Actuator Circuit Low) is: Clutch actuator motor failure or internal short to ground
Typical repair costs for P0902 range from $200 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle may not be able to engage or disengage the clutch properly, leading to inability to shift gears or unexpected stalling. Do not drive; have the vehicle towed to a shop.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0902 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automated Manual Transmission (Clutch Control)
Difficulty
Type
Generic (SAE)
Recommended Tools
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