C1500 on 2005-2014 Opel Zafira (Zafira B) — Transfer Case Contact Plate 'B' Encoder Circuit Failure
1 vehicles · 1 makes · $250-$900 repair
How to diagnose and fix C1500: most-reported vehicles
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Opel Zafira · 2005–2014
Zafira B models use an electro-hydraulic power steering pump (an electric motor and control unit driving a hydraulic pump, made by TRW or ZF) and commonly lose power assistance, often in both directions. Moisture getting past worn seals into the pump housing can damage the control electronics or motor winding, and long periods at full lock overload the motor. 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 electric pump motor/control unit rather than the steering rack.
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
Read the stored fault codes and check the pump's power supply, fuses, battery/charging voltage and connector first, as poor connections can mimic the fault. The electro-hydraulic pump can be remanufactured/repaired (motor and electronics rebuilt) by specialists at lower cost than a new genuine unit, or replaced with a new or reconditioned pump; match the OE number and left/right-hand-drive version. Refill and bleed the steering fluid after fitment.
Sources for this issue (3)
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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?
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.
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?
Repair costs for C1500 range from $250 to $900, depending on the vehicle and root cause.
Which vehicles are affected by C1500?
Au7o has documented C1500 across 1 vehicle models from 1 manufacturers: Opel.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.