Code
P1708
LAND ROVER
P — Powertrain
Clutch circuit interrupter
Views:
UK: 12
EN: 21
RU: 19
AI status
Completed
Completed
100%
Causes
- Faulty/clogged or misadjusted clutch pedal switch (clutch interrupter)
- Open, shorted or chafed wiring in the clutch switch harness
- Corroded/loose connector or terminal at the switch or control module
- Blown fuse or faulty relay affecting the switch circuit
- Poor ground or reference voltage to the switch
- Intermittent contact due to pedal bracket damage or foreign debris
Symptoms
- Engine fails to crank or starter inhibited when clutch depressed (starter interlock)
- Cruise control disabled or unexpectedly disengages
- Transmission will not shift normally or starts in limp mode (depending on system)
- Intermittent no-start or inconsistent clutch-related functions
- Related warning lamp or transmission/engine MIL illuminated
What to check
- Use an OBD-II scanner to confirm P1708 and read freeze frame/related codes
- Visually inspect clutch pedal area, switch, connectors and wiring for damage, contamination or corrosion
- Check fuses and relays for the clutch/starter/interlock circuit
- Backprobe the clutch switch connector with key ON and observe signal while pressing/releasing the pedal
- Measure continuity across the clutch switch (pedal pressed vs released) with a DMM
- Verify reference voltage (typically 5V) and ground presence at the switch connector
Signal parameters
- Reference voltage: typically ~5 V reference to switch (verify manufacturer spec)
- Switch output: logical toggle between reference voltage and ground (or open circuit) when pedal is moved
- Closed switch resistance: near 0 Ω (low ohms) when in closed state; open state: very high/OL
- Signal response: switch should change state immediately when pedal moves; no slow drift or bounce
- No short to battery voltage (12 V) expected on low-voltage logic line; no short to ground when line should be high
Diagnostic algorithm
- Connect a capable scan tool, confirm P1708 and note freeze frame and any related codes. Do not assume a final diagnosis from the code alone.
- Attempt to reproduce symptom with a second technician operating the pedal while observing live data or switch state in the tool.
- Visually inspect the clutch pedal switch, mount, pedal travel, adjacent harness, and connectors for obvious damage, corrosion or foreign objects.
- Check relevant fuses and relays; replace if blown or suspected faulty.
- Backprobe the switch connector: with ignition ON measure the reference voltage, ground continuity and the switch output while pressing/releasing the clutch. Compare to expected logic (see signal_params and manufacturer spec).
- Measure continuity/resistance across the switch terminals directly (pedal pressed vs released). Replace switch if readings are outside spec or inconsistent.
- Perform a wiggle/pressure test on the harness and connector while monitoring live signal for intermittent faults. Repair or replace damaged wiring or connector as found.
- If wiring and switch check OK, trace the harness to the control module and check for continuity/shorts to ground or battery. Repair any harness damage.
- After repair or replacement, clear codes and retest function and live data; road test to verify code does not return.
- If problem persists after switch and wiring verified repaired, consider module input circuit testing per manufacturer service manual or consult dealer-level diagnostic resources for possible TCM/ECM fault.
Likely causes
- Failed or out-of-spec clutch pedal switch
- Damaged wiring or connector at the pedal harness (open/short)
- Loose or corroded connector pins at switch or module
- Blown fuse or poor ground affecting the switch circuit
Fault status
Status
Clutch circuit interrupter fault detected — clutch switch/interrupt circuit open, shorted or intermittent. Control module has logged P1708.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
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