What Does P2552 Mean?
The PCM has detected a fault in the Throttle/Fuel Inhibit Circuit, which is used to reduce or cut engine power on demand. This circuit allows external systems to override normal throttle control for safety or operational reasons.
Common Causes
30%
Open circuit or broken wire in throttle/fuel inhibit control wiring
25%
Faulty inhibit relay or solenoid not responding to PCM commands
20%
Corroded or loose connector at inhibit circuit control device
15%
Failed PCM output driver for inhibit circuit
10%
Short to ground or voltage in inhibit circuit wiring
Diagnostic Steps
1
Step 1: Locate throttle/fuel inhibit relay or solenoid and verify proper power supply and ground connections
2
Step 2: Command inhibit circuit activation with scan tool bi-directional controls and listen/feel for relay/solenoid operation
3
Step 3: Measure voltage at PCM output pin for inhibit circuit during commanded activation (should switch from 12V to ground)
4
Step 4: Test continuity of control circuit from PCM to inhibit device; check for opens, shorts, or high resistance
5
Step 5: Verify inhibit device operation by applying battery voltage directly; replace if device does not actuate
Estimated Repair Cost
$100 - $500
Parts + labor, varies by vehicle and location
The PCM has detected a fault in the Throttle/Fuel Inhibit Circuit, which is used to reduce or cut engine power on demand. This circuit allows external systems to override normal throttle control for safety or operational reasons.
The most common cause of P2552 (Throttle/Fuel Inhibit Circuit) is: Open circuit or broken wire in throttle/fuel inhibit control wiring
Typical repair costs for P2552 range from $100 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Engine power limiting functions may not operate when needed for safety systems. Could affect PTO interlocks or emergency shutdown features.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2552 to identify the root cause.
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Quick Info
Category
Powertrain
System
Throttle Control/Fuel Management
Difficulty
Type
Generic (SAE)
Recommended Tools
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