Accelerometer Rear Circuit Signal Is Not Sensed
Your vehicle's rear acceleration sensor isn't sending a signal to the computer, like a broken speedometer that can't tell how fast you're going. The ECU can't monitor rear-end movement, which affects stability control and safety systems.
The ECU monitors voltage and signal continuity from the rear accelerometer to detect vehicle deceleration and lateral acceleration. When no valid signal is received within expected parameters, the system triggers a fault. The sensor should continuously output a varying analog or digital signal proportional to acceleration forces.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Sensor Signal Voltage | 0.5V to 4.5V with variation | No signal, <0.2V, or >4.8V static |
| Signal Response Time | Real-time dynamic changes | Flat/constant signal or no change over 2+ seconds |
Code C1436 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, C1436 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.