C1500 on Opel: How to Diagnose & Fix
Transfer Case Contact Plate 'B' Encoder Circuit Failure
1 Opel model · 1 documented issue · 1 critical · $250-$900 repair
C1500 on Opel by model: symptoms, diagnosis and fix
Zafira B models fitted with the Delphi/GM electric power steering (EPS) column-mounted unit commonly lose power assistance, often in both directions. The torque/position sensor inside the column-integrated EPS motor unit degrades, and the system stores fault code C1500 (Torque Position Sensor). The fault frequently starts intermittently — assistance cuts out briefly then returns — before becoming permanent, leaving the steering very heavy and hard to turn. This is a recognised failure of the EPS control unit/sensor rather than a hydraulic pump or fluid issue.
Common Symptoms
- Loss of power steering assistance
- Heavy / hard steering in both directions
- Intermittent loss of assist that later becomes permanent
- Power steering warning light
- Steering fault stored in module
How to Fix
Diagnose via stored code (C1500). The EPS column unit can be remanufactured/repaired (sensor and electronics rebuilt) by specialists at lower cost than a new genuine unit, or replaced with a new column. Reset/relearn the steering angle sensor after fitment. Check connector and wiring integrity first, as poor connections can mimic the fault.
Sources for this issue (2)
C1500 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does C1500 mean on a Opel?
C1500 stands for "Transfer Case Contact Plate 'B' Encoder Circuit Failure." This is a chassis code for four-wheel-drive vehicles with an electronically shifted transfer case; DTC references list it for makes such as Ford and Mitsubishi rather than as a General Motors code (GM uses its own C0323/C0327-series codes for transfer case encoder faults, so do not assume this is a GM code). The transfer case control module reads the encoder/contact plate on the transfer case shift motor to know which drive mode the transfer case is actually in (2WD, 4WD High, 4WD Low, Neutral). C1500 sets when the 'B' contact plate circuit reads implausibly or fails, so the module can no longer confirm transfer case position and 4WD mode changes may be refused, incomplete, or stuck. On Opel it is documented across 1 model: Zafira.
What are the most common causes of C1500?
The most common causes of C1500 are: Failed transfer case encoder motor / contact plate assembly, Corroded or water-intruded encoder motor connector, Damaged or chafed wiring between the encoder and the transfer case control module, Worn transfer case shift motor position sensor contacts, Faulty transfer case control module (TCCM). The specific cause varies by vehicle.
How much does it cost to fix C1500 on a Opel?
Published repair estimates on Opel range from $250 to $900 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for C1500 on a different make?
View C1500 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.