What Does P253A Mean?
The PCM has detected an open circuit in the Power Take-Off (PTO) sense circuit. The PTO system allows engine power to be diverted to auxiliary equipment on commercial vehicles and trucks.
Common Causes
35%
Open circuit in PTO sensor wiring harness
30%
Faulty PTO engagement switch or sensor
20%
Disconnected or corroded electrical connector
10%
Blown fuse in PTO circuit
5%
PCM internal circuit fault
Diagnostic Steps
1
Step 1: Visually inspect PTO switch/sensor and all related connectors for damage or disconnection
2
Step 2: Check fuses related to PTO circuit using fuse diagram
3
Step 3: Test continuity of wiring from PTO switch to PCM using wiring diagram
4
Step 4: Measure voltage at PTO switch connector to verify power supply and ground
5
Step 5: Test PTO switch/sensor operation with DVOM while cycling PTO engagement
Estimated Repair Cost
$100 - $400
Parts + labor, varies by vehicle and location
The PCM has detected an open circuit in the Power Take-Off (PTO) sense circuit. The PTO system allows engine power to be diverted to auxiliary equipment on commercial vehicles and trucks.
The most common cause of P253A (PTO Sense Circuit/Open) is: Open circuit in PTO sensor wiring harness
Typical repair costs for P253A range from $100 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
PTO will not function but vehicle operation is not affected. No direct safety concern unless PTO equipment is critical for safe operation.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P253A to identify the root cause.
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Quick Info
Category
Powertrain
System
PTO System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
