What Does P1308 Mean?
P1308 indicates the chassis acceleration sensor signal is below the expected voltage range. The PCM interprets this as a short to ground or an open circuit condition in the sensor's output. Without a valid acceleration signal, the rough road misfire detection compensation algorithm cannot function properly.
Common Causes
30%
Short to ground in the sensor signal wire
30%
Failed chassis acceleration sensor (output stuck low)
20%
Open circuit in the sensor power supply wire
15%
Corroded or disconnected sensor connector
5%
PCM input circuit pulled low internally
Diagnostic Steps
1
Check the chassis acceleration sensor connector for proper seating, corrosion, or water intrusion.
2
Measure the reference voltage at the sensor connector with it unplugged — it should read approximately 5V on the reference wire.
3
Check the signal wire for a short to ground by disconnecting both ends and measuring resistance to chassis ground.
4
Verify the ground wire has less than 0.1 ohm resistance back to the PCM ground point.
5
If wiring checks pass, replace the chassis acceleration sensor and retest.
Estimated Repair Cost
$80 - $350
Parts + labor, varies by vehicle and location
P1308 indicates the chassis acceleration sensor signal is below the expected voltage range. The PCM interprets this as a short to ground or an open circuit condition in the sensor's output. Without a valid acceleration signal, the rough road misfire detection compensation algorithm cannot function p...
The most common cause of P1308 (Chassis Acceleration Sensor Signal Low) is: Short to ground in the sensor signal wire
Typical repair costs for P1308 range from $80 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The misfire detection system loses its ability to filter out rough road inputs, which may cause false misfire codes or suppress real misfire detection. No immediate safety hazard but should be repaired promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1308 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Management / Misfire Detection
Difficulty
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