What Does P215B Mean?
The PCM detects a correlation problem between the calculated vehicle speed and the transmission output shaft speed sensor. The two speed measurements do not match within acceptable parameters.
Common Causes
28%
Incorrect tire size causing speed calculation mismatch
25%
Faulty transmission output shaft speed sensor
20%
Transmission internal slippage (torque converter or clutches)
15%
Damaged output shaft speed sensor tone ring or reluctor
12%
Incorrect final drive ratio programmed in PCM after differential service
Diagnostic Steps
1
Step 1: Verify tire size matches vehicle specifications and PCM programming
2
Step 2: Monitor output shaft speed sensor and vehicle speed simultaneously during steady-state driving
3
Step 3: Calculate expected correlation ratio based on final drive and tire size; compare to actual data
4
Step 4: Check for transmission slippage by monitoring engine RPM vs output speed vs vehicle speed
5
Step 5: Inspect output shaft speed sensor and tone ring for damage or excessive play
Estimated Repair Cost
$150 - $2,500
Parts + labor, varies by vehicle and location
The PCM detects a correlation problem between the calculated vehicle speed and the transmission output shaft speed sensor. The two speed measurements do not match within acceptable parameters.
The most common cause of P215B (Vehicle Speed - Output Shaft Speed Correlation) is: Incorrect tire size causing speed calculation mismatch
Typical repair costs for P215B range from $150 to $2,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May indicate transmission slippage which can lead to sudden loss of drive. If transmission is slipping, avoid aggressive driving and repair promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P215B to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission
Difficulty
Type
Generic (SAE)
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