P0700
Medium SeverityTransmission Control System
Transmission System
What Does P0700 Mean?
The TCM (Transmission Control Module) has detected a fault and sent a message to the ECM. This is a general indicator that transmission-specific codes are stored.
Common Fix
Varies — depends on specific transmission codes
Estimated Cost (DIY)
$50 - $1,000
Symptoms
- ⚠️Check engine light
- ⚠️Transmission warning light
- ⚠️Harsh or delayed shifting
- ⚠️Limp mode
Common Causes
Transmission solenoid failurelikely
Low transmission fluidlikely
Wiring issue to transmissionpossible
TCM failurepossible
How to Diagnose P0700
- 1Check transmission fluid level and condition
- 2Scan for transmission-specific codes (P07xx)
- 3Check wiring to transmission
- 4Service transmission if fluid is dark
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Frequently Asked Questions
- Is P0700 always a transmission problem?
- P0700 itself just means the TCM flagged an issue. Scan specifically for transmission codes (P07xx) to identify the actual problem.
- Can low fluid cause P0700?
- Yes — low or degraded transmission fluid is one of the most common causes. Check fluid level and condition first.