Shift Fork Position Circuit Low
The P2842 code indicates that the transmission control module (TCM) has detected a low voltage condition in the shift fork position sensor circuit. This sensor monitors the position of the shift fork within the transmission to ensure proper gear engagement. A low circuit condition typically means the signal voltage is below the expected range, which can be caused by wiring issues, sensor faults, or internal transmission problems.
01. Most Common Causes
- Faulty shift fork position sensor
- Damaged or corroded wiring/connectors in the sensor circuit
- Short to ground in the sensor circuit
- Transmission control module (TCM) failure
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Harsh or delayed shifting
- Transmission stuck in a single gear
- Reduced fuel economy
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional transmission codes.
Step 2: Visually inspect the shift fork position sensor and its wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor circuit voltage with a multimeter; compare to manufacturer specifications.
Step 4: If wiring and sensor are okay, test the TCM for proper output signals.
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 erratic shifting or transmission damage. Have it diagnosed and repaired promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and sensor replacement, but can be higher if wiring repairs or TCM replacement is needed.