P0700
Category: Powertrain
Urgency:
Critical Severity
P0700: Transmission Control System Malfunction (TCM Request)
Code P0700 is an informational diagnostic code set by the ECM to alert you that the Transmission Control Module (TCM) has detected an internal transmission fault.
Common Symptoms of P0700
- • Check Engine Light on
- • Transmission stuck in Limp Mode (e.g. 2nd or 3rd gear only)
- • Transmission slipping, delayed gear engagement, or harsh clunks
- • Transmission temperature warning light
Root Causes for Code P0700
- • Defective shift solenoids or pressure control solenoid
- • Low or severely burned automatic transmission fluid
- • Internal mechanical transmission clutch failure
- • Faulty Transmission Control Module (TCM) or valve body
Step-by-Step DIY Diagnostic & Inspection Guide
1
Use a high-end OBD-II scanner capable of reading TCM transmission codes.
2
Check transmission fluid level and color (should be bright pink/red, not dark brown).
3
Inspect transmission wiring harness for fluid leaks or corrosion.
Estimated Repair Costs
Replacement Parts:
$100 - $800
Shop Diagnostic / Labor:
$150 - $600
Total Estimated Cost:
$250 - $1,400
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