P2802 moderate

Transmission Range Display Circuit Low

The P2802 code means the vehicle's onboard diagnostic system has detected: Transmission Range Display Circuit Low. This is a moderate severity code.

My Garage →

Keep driving?: Yes, but fix soon
DIY difficulty: moderate
Estimated cost: $100 - $500 (parts and labor)

Check Your Fluid First

ANCEL AD310 OBD-II Scanner

Read and clear transmission codes. Many trans codes are caused by low or burnt fluid -- check level and color before assuming the worst.

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Read Transmission Codes

LAUNCH CRP123X (Reads All Systems)

Basic scanners only read engine codes. This reads transmission, ABS, and airbag too.

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Common Symptoms

Gear indicator stuck showing one position
Display always shows Park or lowest gear
Check engine light on
No change in display when shifting

Probable Causes (Ranked by Likelihood)

Short to ground in display circuit Very High
CAN bus low wire shorted High
TCM display output pulled low Moderate
Instrument cluster input grounded Low

Step-by-Step Diagnostic Procedure

Check display circuit for short to ground
Test CAN bus low wire integrity
Verify TCM display output changes with gear selection
Inspect instrument cluster input circuits

Frequently Asked Questions

Why is my gear indicator stuck on one position?

A low circuit condition sends a constant signal to the cluster, making it display only one gear position regardless of actual transmission state.

Can a CAN bus short affect other systems?

Yes. A short on the CAN bus can disrupt communication for all modules on that network, potentially affecting multiple vehicle systems.

How do I test the CAN bus?

Measure resistance between CAN high and CAN low at the diagnostic port. Normal is approximately 60 ohms. Significantly lower readings indicate a short.