P1183

Code

CITROEN P — Powertrain

Vacuum monitoring short circuit to earth or open circuit

Brand: CITROEN

Type: P — Powertrain

Views: UK: 3 EN: 5 RU: 8

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Page language: EN

Read stored freeze-frame and live data with a capable scan tool; confirm P1183 is current or historic
Clear codes and operate vehicle to reproduce; note conditions when fault returns
Visually inspect sensor, connector and wiring for damage, corrosion, or pin push-out
Backprobe the sensor harness and measure signal voltage with ignition on and engine running
Check presence of sensor reference voltage (usually 5 V) and good ground at the harness
Perform continuity/resistance check between sensor pins and ECU connector (check for shorts to chassis ground)

Reference supply to sensor typically 5 V (consult vehicle wiring diagram for exact value)
Sensor output expected in a nominal range (commonly ~0.5–4.5 V depending on vacuum/pressure); open circuit often reads near 0 V or reference voltage, short to ground near 0 V
Ground continuity: harness ground to chassis should be low resistance (near 0 Ω) — check for high resistance or intermittent ground
Open-circuit: infinite resistance on signal conductor between sensor and ECU; Short-to-earth: low resistance from signal conductor to chassis ground
Consult manufacturer wiring diagrams for exact pin assignments and voltage values for this vehicle

Use a scan tool to confirm P1183 and capture live data. Note whether the fault is current, intermittent or historic.
Visually inspect the vacuum sensor, connector and wiring from sensor to ECU for damage, heat chafe or corrosion. Repair obvious damage.
With the connector attached, backprobe the signal, reference and ground pins. With ignition on, verify reference voltage present at the harness (typically 5 V).
Start engine (if safe) and monitor signal voltage. Note if voltage is plausible and if it changes with engine vacuum. If signal reads ~0 V, suspect short to ground or open.
With ignition off, disconnect sensor and measure resistance between signal wire and chassis ground. A near-zero reading indicates a short to chassis; very high or infinite indicates open circuit.
Perform continuity check between sensor connector and ECU connector for signal, reference and ground. Repair any wiring faults found (splice, replace harness section, or repair connector).
If wiring and connectors check good, substitute a known-good sensor or bench-test the sensor per manufacturer instructions. Replace sensor if faulty.
After repairs, clear codes and road-test to confirm fault does not return. If wiring and sensor are good but code persists, consider ECU diagnosis by specialist.
Document repairs and recheck for stored/active codes after several drive cycles.

Open or broken signal wire between vacuum sensor and ECU
Short from the sensor signal wire to chassis ground (eg chafed wiring against bodywork)
Corroded/poor connector at the sensor causing an open or intermittent contact
Failed vacuum/pressure sensor element
Missing sensor reference supply or ground at the harness

⚠️ Status

Vacuum monitoring circuit — short to earth (ground) or open circuit detected in sensor wiring or sensor.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5 - 2.0 hours

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P1183 — Vacuum monitoring short circuit to earth or open circuit