Code
P0792
Generic
P — Powertrain
Intermediate Shaft Speed Sensor A Circuit Range/Performance
Views:
UK: 12
EN: 40
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
Similar codes
Workshop Manuals
Available brands with manuals
1
LAND ROVER 1
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualWorkshop Manual Supplement and Body Repair Manual for the Land Rover Defender. Includes general specifications, maintenance schedules, tuning data and step‑by‑step repair procedures for engine, transmission, suspension, brakes, electrical and body repairs. Covers Defender models from 1999 and 2002 model years.
399,00 UAH
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Code
P0792
LAND ROVER
P — Powertrain
Intermediate speed sensor of axle A - range / performance of circuit
Views:
UK: 3
EN: 24
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
1
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualWorkshop Manual Supplement and Body Repair Manual for the Land Rover Defender. Includes general specifications, maintenance schedules, tuning data and step‑by‑step repair procedures for engine, transmission, suspension, brakes, electrical and body repairs. Covers Defender models from 1999 and 2002 model years.
399,00 UAH
Your 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