Hybrid Transmission High Voltage Interlock
What does P2994 mean?
The P2994 code means the vehicle's onboard diagnostic system has detected: Hybrid Transmission High Voltage Interlock. This is a critical severity code.
Common Symptoms
- Hybrid system warning light on
- Reduced hybrid system performance
- Abnormal electric motor operation
- Decreased fuel economy
Probable Causes (Ranked by Likelihood)
- Failed high voltage interlock component Very High
- Hybrid control module software issue High
- High voltage connection corrosion Moderate
- Hybrid control module internal fault Low
Step-by-Step Diagnostic Procedure
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Scan for hybrid system DTCs with compatible scanner
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Inspect high voltage interlock connections and wiring
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Measure high voltage isolation resistance
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Check hybrid system cooling circuit operation
Frequently Asked Questions
Is this a hybrid-specific code?
Yes, this code is specific to hybrid and electric vehicle transmission systems and requires a technician trained in hybrid vehicle repair.
Is it safe to work on this myself?
No, high voltage hybrid components can be lethal. Only trained and certified hybrid technicians should work on these systems.
Will this affect my fuel economy?
Yes, hybrid transmission issues typically reduce or eliminate the fuel savings that the hybrid system provides, resulting in noticeably higher fuel consumption.
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