Throttle/Fuel Inhibit Circuit
The P2552 code means the vehicle's onboard diagnostic system has detected: Throttle/Fuel Inhibit Circuit. This is a critical severity code.
- Keep driving?
- No — stop driving
- DIY difficulty
- hard
- Estimated cost
- $100 - $800 (parts and labor)
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What Are the Symptoms of P2552?
- Engine will not rev above idle
- Throttle input completely ignored
- Multiple warning lights on
- Vehicle in emergency limp mode
What Causes P2552? (Most Likely First)
- Safety circuit activated due to detected fault Very High
- Wiring issue in throttle inhibit circuit High
- Failed throttle position sensor triggering inhibit Moderate
- ECM software fault activating inhibit erroneously Low
Can I Still Drive with P2552?
No — stop driving. P2552 is rated critical severity. Continuing to drive in this state risks further damage — get it looked at before your next trip.
Frequently Asked Questions
What is the throttle/fuel inhibit circuit?
It is a safety circuit that disables throttle and fuel delivery when the ECM detects a potentially dangerous fault, preventing unintended acceleration.
Why won't my engine rev above idle with P2552?
The inhibit circuit has been activated, intentionally limiting engine operation to idle for safety. Another fault code likely triggered this protective response.
Can I clear P2552 to restore normal operation?
Clearing codes may temporarily release the inhibit, but the underlying fault must be repaired. The code and limitation will return if the root cause is not fixed.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P2552?
-
Scan for all stored codes that may have triggered inhibit
-
Check throttle inhibit circuit wiring and connectors
-
Test throttle position sensor signals
-
Clear codes and test if inhibit releases
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
Which Vehicles Commonly Get P2552?
- 2010-2020 Toyota Camry
- 2012-2019 Nissan Altima
- 2008-2018 Ford F-150
- 2011-2020 Chevrolet Malibu
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