P0792

Code

Generic P — Powertrain

Intermediate Shaft Speed Sensor A Circuit Range/Performance

Brand: Generic

Type: P — Powertrain

Views: UK: 22 EN: 79 RU: 30

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty intermediate shaft speed sensor (A)
Damaged or corroded connector or wiring (open, short to power/ground, high resistance)
Missing/damaged reluctor/encoder ring or magnet on the intermediate shaft
Shorted or intermittent reference voltage or ground to sensor
Faulty TCM/PCM input or internal electronics
Excessive transmission fluid contamination or metal debris affecting sensor/readings

Symptoms

Check Engine Light (MIL) on and DTC P0792 present
Transmission shift issues: harsh shifts, delayed or erratic upshifts/downshifts
Transmission may default to limp-in mode
Erratic speedometer or cruise control faults (on some vehicles)
Possible abnormal transmission noise if internal damage is present

What to check

Read freeze-frame and live data with a scan tool: intermediate shaft speed (ISS) value and compare to input/output shaft speeds
Check for other related DTCs (transmission speed sensor codes, communication faults)
Visual inspection of sensor connector and wiring for damage, corrosion, bent pins or contamination
Backprobe sensor connector and check reference voltage (typically 5 V for hall sensors), ground, and signal while cranking/rotating shaft
Measure sensor resistance (if applicable) and compare to manufacturer spec
Use an oscilloscope to inspect signal waveform at idle and as shaft is rotated (look for square wave or VR sine wave)

Signal parameters

Hall-effect sensor: digital square-wave signal, 0–5 V pulses, frequency increases with shaft RPM
Variable-reluctance (VR) sensor: AC sine waveform, amplitude grows with RPM (may be tens of millivolts to volts depending on speed)
Reference voltage usually ~5 V (hall) and solid ground; signal switches between reference and ground
Signal frequency should track proportionally with input and output shaft speeds; no prolonged dropouts or constant/stuck values

Diagnostic algorithm

Retrieve and record freeze-frame and all active/pending/transmission-related codes. Note vehicle conditions when code set (engine temp, gear, speed).
Visually inspect sensor and harness at the transmission for obvious damage, crushed wiring, rodent chew, or open connectors. Repair any visible wiring damage.
With key on engine off, disconnect the sensor connector and inspect pins for corrosion, bent pins, or debris. Clean or repair connector as needed.
Reconnect and backprobe the connector. Verify reference voltage (typically ~5 V) and ground at key-on. If reference/ground missing, trace wiring back to PCM/TCM.
Measure sensor resistance if manufacturer specification available. Replace sensor if out of spec. Note: VR sensors require different checks (AC output) than hall sensors.
With a scan tool monitor live ISS data. Manually rotate intermediate shaft (or perform controlled road/bench test) and verify the sensor produces a changing speed reading. Check for dropouts or stuck values.
Use an oscilloscope to verify waveform shape and amplitude across engine/transmission speed range. Look for noisy, weak, or missing waveforms indicating sensor or tone wheel problems.
Compare intermediate shaft speed to input/turbine and output/turbine speeds. Verify ratios make sense; a fixed offset or mismatch may indicate missing teeth on reluctor or mechanical faults.
If wiring checks OK and sensor waveform is valid but code persists, check for intermittent wiring faults with wiggle test and inspect grounds and shield continuity. Repair any short/open.
After repair or replacement, clear codes and perform a road test to confirm proper operation and that code does not return. If still present, consider module input fault — consult manufacturer TSBs and consider TCM/PCM testing or reflash.

Likely causes

Wiring harness damage at axle or transmission harness splice (most common)
Contaminated or corroded sensor connector
Failed hall-effect or variable-reluctance sensor
Damaged reluctor ring (missing teeth, bent, loose)
Intermittent ground or reference voltage caused by connector corrosion

Fault status

⚠️ Status

P0792 - Intermediate Shaft Speed Sensor A Circuit Range/Performance. Stored when the transmission control unit detects an intermediate shaft speed sensor A signal that is outside expected voltage/frequency range or otherwise inconsistent with other speed inputs.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours