Code
P0792
Generic
P — Powertrain
Intermediate Shaft Speed Sensor A Circuit Range/Performance
Views:
UK: 12
EN: 42
RU: 14
AI status
Completed
Completed
100%
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
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Code
P0792
LAND ROVER
P — Powertrain
Intermediate speed sensor of axle A - range / performance of circuit
Views:
UK: 3
EN: 26
RU: 8
AI status
Completed
Completed
100%
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
Similar codes
Workshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualLand Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualLand Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop ManualYour experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
