P07C6

Code

Generic P — Powertrain

Intermediate Shaft Speed Sensor A Circuit High

Brand: Generic

Type: P — Powertrain

Views: UK: 25 EN: 55 RU: 39

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Page language: EN

Causes

Short to battery (B+) on the sensor signal circuit
Faulty intermediate shaft speed sensor (internal failure)
Corroded, bent or damaged connector pins
Open or damaged wiring causing abnormal voltage readings
Poor or missing ground or reference supply from the control module
PCM/TCM internal fault (less common)

Symptoms

MIL (Check Engine Light) illuminated
Transmission shifting abnormal or stuck in limp/limited mode
Incorrect vehicle speed or no speed reading from intermediate shaft
Harsh or delayed shifts, torque converter lock problems
Possible reduced drivability or limp-home behavior

What to check

Read freeze frame and live data with a scan tool; confirm P07C6 and any related codes
Visual inspect sensor connector, wiring, and transmission harness for damage or corrosion
Backprobe and check for proper reference voltage (typically ~5 V) and good ground at connector
Measure signal line voltage at key states (ignition on, cranking, running)
Inspect for signs of fluid ingress, rodent damage, pin push-out, or melted insulation
Check for Technical Service Bulletins (TSBs) or common repair notes for this vehicle

Signal parameters

Normal: sensor produces a pulsed or alternating waveform whose frequency increases with shaft speed; amplitude typically swings between ~0 V and near the supply voltage (~5 V) depending on sensor type
Expected reference supply: ~5 V (varies by manufacturer) to sensor, and a solid ground
Circuit-high symptom: signal-line voltage at rest or while running reads high (e.g., >4.5 V) or stuck at battery voltage with no valid pulsed waveform
No valid frequency or irregular waveform indicates sensor or wiring issue

Diagnostic algorithm

Confirm the code with a scan tool, note freeze frame and check for additional transmission or CAN network codes.
Perform a thorough visual inspection of the sensor, connector, and harness—look for damage, corrosion, fluid contamination, pin push-out, or splices.
With ignition ON, backprobe the sensor connector: verify reference voltage (≈5 V), sensor ground continuity, and the signal line resting voltage. Report any voltage >4.5 V on the signal line.
Start engine and slowly increase shaft speed (if safe) while monitoring the signal waveform with an oscilloscope or live-data frequency/readout. A healthy sensor shows a clean pulsed waveform; a circuit-high will show stuck-high/no pulses or pulses riding at high DC level.
If signal is high but reference or ground is missing or incorrect, trace and repair the reference/ground circuit. If reference and ground are good, check for short to B+ on the signal wire (inspect harness for pin contact or use a wiring diagram to test continuity to battery).
Unplug the sensor with the ignition ON and observe the signal and scanner: if signal drops to open-circuit expected level or code changes, compare behavior to manufacturer guidance to isolate harness vs sensor.
Measure resistance/continuity of the sensor wiring back to the PCM/TCM; repair any shorted, open, or high-resistance circuits.
If wiring and module signals are good, bench-test or replace the intermediate shaft speed sensor. After repair, clear codes and test-drive to confirm the fault does not return.
If problem persists after sensor and wiring repairs, investigate PCM/TCM input circuit or consult manufacturer diagnostics for module-level faults.

Likely causes

Wire chafed and contacting battery or ignition feed (short to B+)
Failed Hall-effect or magnetic speed sensor output stage
Connector contamination or bent pin causing intermittent high voltage
Loose or corroded ground at transmission harness
Damaged harness between sensor and PCM/TCM

Fault status

⚠️ Status

Intermediate Shaft Speed Sensor A circuit voltage higher than expected (Circuit High). Possible short to battery, faulty sensor, connector/wiring damage, or poor ground/reference.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 3.0 hours