What Does P1385 Mean?
The PCM has detected a misfire condition but cannot access rough road data to differentiate between actual misfires and bumps in the road. This indicates a communication issue or sensor problem.
Common Causes
30%
Faulty or contaminated crankshaft position sensor
25%
Communication fault with ABS module (rough road data source)
20%
Actual engine misfire with concurrent ABS/CAN bus fault
15%
Damaged CAN bus wiring or poor connections
10%
PCM software needs update or PCM malfunction
Diagnostic Steps
1
Step 1: Check for additional codes related to ABS, traction control, or communication faults
2
Step 2: Inspect crankshaft position sensor and wiring for damage or excessive air gap
3
Step 3: Use scan tool to verify communication with ABS module and check for rough road sensor data
4
Step 4: Test CAN bus circuits for proper voltage, resistance, and continuity between modules
5
Step 5: Perform freeze frame analysis to determine if actual misfire exists and diagnose accordingly
Estimated Repair Cost
$100 - $1,500
Parts + labor, varies by vehicle and location
The PCM has detected a misfire condition but cannot access rough road data to differentiate between actual misfires and bumps in the road. This indicates a communication issue or sensor problem.
The most common cause of P1385 (Misfire Detected - Rough Road Data Not Available) is: Faulty or contaminated crankshaft position sensor
Typical repair costs for P1385 range from $100 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May result in engine misfire and loss of power. Rough road compensation loss could cause false misfire detection on uneven roads.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1385 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Management and Communication Network
Difficulty
Type
Manufacturer
Recommended Tools
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