C1702: Right Rear Wheel Sensor Short to Battery
Diagnostic trouble code C1702 indicates a short circuit to battery positive voltage (Vbat) in the right rear wheel sensor circuit. The control module has detected an abnormally high voltage on the sensor signal line, which should operate at a much lower voltage. This fault typically relates to the tire pressure monitoring system (TPMS) or the anti-lock brake system (ABS) wheel speed sensor, depending on the vehicle configuration. The short to battery causes the sensor signal to be lost or saturated, preventing the control module from reading data correctly and triggering the corresponding warning light on the dashboard.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty right rear wheel sensor (internal short or damage)
- Short circuit in the sensor signal wiring to a battery positive voltage source
- Damaged, corroded, or bent pins in the sensor connector causing a short
- Faulty control module (BCM or ABS module)
3. Symptoms You Will Notice
- Illuminated TPMS or ABS warning light on the dashboard
- Inaccurate or missing tire pressure readings (if TPMS-related)
- ABS system may not function properly, potentially activating at low speeds
4. Step-by-Step Diagnosis
Scan the vehicle for all stored codes and note freeze frame data.
Visually inspect the right rear wheel sensor wiring and connector for damage, corrosion, or signs of shorting to battery voltage.
Measure voltage at the sensor signal wire with the ignition on; compare to manufacturer specifications (should be low, not battery voltage).
Test the sensor resistance and compare to specs; replace if out of range.
If wiring and sensor are good, suspect a faulty control module and perform further module diagnostics.
5. Frequently Asked Questions
Is it safe to drive?▼
The vehicle may be driven short distances, but the ABS or TPMS system will be compromised. Braking performance may be affected in slippery conditions, and tire pressure monitoring will be lost. It is recommended to address the issue promptly.
How much does it cost to fix?▼
Repair costs typically range from $100 to $400, depending on whether the sensor, wiring, or control module needs replacement. Sensor replacement is usually $100-$200, while module replacement can exceed $400.