Park Brake Switch # 2 Released Circuit Failure
The parking brake's secondary switch isn't sending the proper electrical signal when released, like a stuck light switch that won't turn off. The ECU detects this electrical fault and can't confirm the brake is actually disengaged.
The ECU monitors the voltage signal from the secondary park brake release switch. When the brake is released, the switch should transition from a closed to open circuit state, changing the signal voltage. If this transition doesn't occur or the circuit remains stuck, the ECU sets the fault code.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Park Brake Switch #2 Voltage | Circuit transitions from ~12V (applied) to ~0V (released) or open circuit state | Voltage remains stuck in applied state or no transition detected |
| Switch Release Signal Timing | Signal changes within 500ms of brake lever/pedal release | No signal change detected or change occurs outside expected window |
Code C1162 is classified as a serious fault. If your check engine light is flashing — not just steady — pull over safely and do not continue driving. A flashing CEL indicates an active misfire or critical failure that can cause catalytic converter damage within minutes or permanent engine harm within miles. Contact a certified mechanic immediately. Do not attempt roadside repairs on high-severity codes unless you are trained to do so.
Once the fault is repaired, C1162 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.