Transmission

P0792 — Intermediate Shaft Speed Sensor Circuit Range/Performance

Severity: medium Drive with care, to a shop

What P0792 means

The transmission control unit (TCM or PCM) compares the intermediate shaft speed sensor signal with the input and output shaft speeds and the gear that is commanded. If the signal doesn't match what is expected, or drops out intermittently, P0792 is stored. The cause can be the sensor, its circuit or a mechanical problem inside the transmission.

Symptoms

  • Check Engine or transmission warning light on
  • Shift flare (RPM jumps between gears) or slipping
  • Transmission stuck in one gear (limp mode)
  • Harsh or delayed shifts
  • Erratic speedometer in some vehicles
  • Reduced fuel economy

Possible causes

  1. Failed intermediate shaft speed sensor
  2. Corroded or damaged sensor connector
  3. Open, shorted or chafed wiring to the sensor
  4. Poor connection or corrosion at terminals
  5. Dirty, low or degraded fluid, or metal debris on the sensor
  6. Internal transmission wear (clutches, drums, planetary parts)
  7. TCM or PCM fault (uncommon)

How to diagnose

  1. Scan all codes and freeze-frame data, and look for other shaft speed sensor codes
  2. Check transmission fluid level and condition: color, smell, debris
  3. Inspect the sensor connector and harness for damage, moisture and corrosion
  4. Compare intermediate shaft speed with input and output speed on a scan tool while driving
  5. Test sensor resistance, power and ground per the factory wiring diagram
  6. Check the sensor waveform with an oscilloscope
  7. Remove the sensor and inspect it for debris, metal particles and damage
  8. If the electrical side is good, test line pressure and inspect clutches for wear

Common fixes

  • Clean or replace the intermediate shaft speed sensor
  • Repair or replace the wiring and connector
  • Change the transmission fluid and filter
  • Repair or rebuild the transmission for internal wear
  • Reprogram or replace the TCM/PCM if confirmed faulty

Questions and answers

What does P0792 mean?

The control unit is getting a signal from the intermediate shaft speed sensor that doesn't match what it expects. The sensor, wiring or the transmission itself can be at fault.

Can I drive with P0792?

For a short distance with care, yes, but the transmission may go into limp mode or slip. Get it checked soon to avoid transmission damage.

How do I fix P0792?

Start with the fluid, connector and wiring, then test or replace the sensor. If those are fine, the transmission may have internal wear that needs a shop inspection.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.