P2803 moderate

Transmission Range Display Circuit High

The P2803 code means the vehicle's onboard diagnostic system has detected: Transmission Range Display Circuit High. 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 showing highest gear constantly
  • Display stuck on Drive or Overdrive
  • Check engine light on
  • No response from display when shifting to Reverse or Park

Probable Causes (Ranked by Likelihood)

  • Short to voltage in display circuit Very High
  • CAN bus high wire shorted to power High
  • TCM display output stuck high Moderate
  • Instrument cluster input shorted high Low

Step-by-Step Diagnostic Procedure

  1. Check display circuit for short to voltage

  2. Test CAN bus high wire for shorts

  3. Verify TCM output changes with gear changes

  4. Check cluster for internal shorts

Frequently Asked Questions

Can I trust my backup camera indication if the display is wrong?

The backup camera activation is typically tied to the transmission range sensor, not the display circuit. It should still activate in reverse even if the display is wrong.

Is P2803 the same as P2778?

No. P2778 relates to the range sensor B circuit itself, while P2803 relates to the display circuit that shows gear position to the driver.

Can an aftermarket radio cause display issues?

If the aftermarket installation disrupted CAN bus wiring, it can affect the gear display and other instrument cluster functions.

Sources

This page is built from documented references. Verify against your own service info before repair work.

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