C1707 – Low pressure (left rear) (Nissan)

Nissan-specific code — factory diagnostic data

C1707 means the Nissan Leaf has detected low tire pressure at the left rear. You will typically see a tire pressure warning, and the car may feel less stable in turns. According to Nissan factory diagnostic data, this manufacturer-specific chassis code indicates “Low pressure (left rear)” from the Air pressure monitor system. This code does not prove a sensor has failed. It tells you the system considers the left rear pressure below its expected limit, or the reported value does not meet the module’s plausibility rules for that wheel position.

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C1707 Quick Answer

C1707 on a Nissan Leaf points to low tire pressure at the left rear as recognized by the Air pressure monitor. Confirm actual tire pressure first, then verify the TPMS reading matches before replacing any parts.

What Does C1707 Mean?

Official definition: “Low pressure (left rear).” In plain terms, the Air pressure monitor has decided the left rear tire pressure is too low. In practice, that means you must treat it as a safety-related warning until you confirm the tire’s actual pressure and condition.

What the module checks: the Air pressure monitor looks at the left rear tire pressure value reported by the wheel sensor and compares it to stored limits and plausibility rules. Why that matters: low pressure can come from a real leak, but the same code can set when the module receives an incorrect pressure value due to a sensor, registration, or signal issue. Use the code as a pointer to the suspect area, not as proof of a bad sensor.

Theory of Operation

On Nissan vehicles, the tire pressure monitoring system uses a pressure sensor inside each wheel assembly. Each sensor transmits an ID and pressure data to the Air pressure monitor, which then decides when to warn the driver.

C1707 sets when the Air pressure monitor believes the left rear pressure is below its threshold, or when the reported pressure fails plausibility for that wheel position. A real pressure loss triggers the most common path. A wrong sensor ID assignment, weak transmission, or sensor data problem can also make the monitor “see” low pressure at the left rear.

Symptoms

You will usually notice a tire pressure warning first, then confirm the affected wheel using scan data or a gauge.

• Warning lamp TPMS / tire pressure warning illuminates
• Message low tire pressure warning shown in the cluster display
• Handling softer ride, increased sway, or less precise steering feel
• Pull vehicle may drift or pull if pressure difference grows
• TPMS data left rear reading shows low, implausible, or slow-updating pressure
• Relearn behavior warning returns soon after inflation if the module “sees” the same left rear value
• Temperature sensitivity warning appears after a cold soak, then changes after driving

Common Causes

• Actual low tire pressure at the left rear: A true underinflation condition drives the air pressure monitor to flag the left rear as low.
• Slow leak at the valve core or valve stem seal: A leaking service valve bleeds pressure over time and triggers the low-pressure logic after a drive.
• Tire bead leak or rim sealing issue: Corrosion or debris at the bead seat lets air escape and the pressure drops below the expected range.
• Puncture or tread/sidewall damage: A nail or cut can reduce pressure quickly and set the code soon after the loss begins.
• Temperature-driven pressure drop with marginal inflation: Cold ambient conditions lower tire pressure and can push a borderline tire into a “low” event.
• TPMS sensor reporting error or drift: A sensor can report an inaccurately low value, which misleads the air pressure monitor into setting C1707.
• Sensor battery weak or intermittent transmission: A weak sensor battery can cause dropouts or corrupt data that the module interprets as an implausible low reading.
• Incorrect wheel/tire configuration or sensor registration mismatch: A mismatched ID or unlearned sensor can map the wrong sensor to the left rear position and point you at the wrong tire.
• Harness/connector issue affecting the air pressure monitor: Poor power, ground, or connector tension at the module can skew pressure processing and create false low-pressure flags.

Diagnosis Steps

Tools you need include a scan tool that reads Nissan chassis and Air pressure monitor data, a quality tire pressure gauge, and an air source. Use a DMM for power and voltage-drop checks. A smoke bottle or spray bottle helps find slow leaks. Keep service information available for sensor ID learning and data list items.

1. Confirm C1707 in the Air pressure monitor, then record freeze frame data. Focus on ignition state, battery voltage, vehicle speed, and any other TPMS-related DTCs stored with it. Freeze frame shows the conditions when the code set, not what the tire does now.
2. Perform a fast visual walk-around before meter work. Check the left rear tire for obvious low profile, sidewall damage, punctures, or a damaged valve stem cap/valve core. If the tire looks low, do not continue driving tests until you correct pressure safely.
3. Check fuses and power distribution that feed the Air pressure monitor and related chassis circuits. Verify the fuse has tight fit and clean terminals. Do this before you back-probe the module, since a supply fault upstream can mimic a module or sensor issue.
4. Verify Air pressure monitor power and ground integrity with voltage-drop testing under load. Load the circuit by keeping the system awake per scan tool or ignition state, then measure voltage drop across the ground path. Keep ground drop under 0.1V with the circuit operating, since continuity alone can miss high resistance.
5. Use the scan tool data list to compare the left rear pressure reading to a known-good gauge reading taken at the valve stem. Also compare the left rear to the other three wheels on the Leaf. A large disagreement points toward a sensor/data issue or a mapping problem, not just low inflation.
6. If pressure truly reads low on the gauge, inflate to the placard specification and clear codes. Drive the vehicle long enough for the system to update, then recheck for pending versus confirmed code status. Note that some monitoring logic needs more than one drive cycle to confirm a fault, while a real low-pressure condition typically returns quickly once it repeats.
7. If the gauge shows correct pressure but the scan tool still shows low, verify sensor identification and position learning. Check the scan tool for sensor ID status and any “unregistered” or “not received” indicators. Correct registration or perform the Nissan relearn procedure if the data indicates a mismatch.
8. Inspect the valve stem and sensor area closely for physical damage or air leakage. Apply leak detection solution at the valve core, around the stem, and at the bead area. A slow leak often sets C1707 after a drive when centrifugal forces and temperature changes worsen the leak.
9. Check for intermittent sensor transmission issues using a scan tool snapshot during a short road test. A freeze frame captures the moment the DTC set, while a snapshot lets you capture live data when an intermittent drop occurs. Watch for pressure values that drop to zero, freeze, or jump while the gauge pressure stays stable.
10. If you suspect a module-side issue, inspect Air pressure monitor connectors and harness routing. Look for water intrusion, pin fit problems, corrosion, or tension on the harness. Verify repair by clearing codes, confirming normal wheel pressure data, and completing a drive cycle to ensure C1707 stays out.

Professional tip: Treat C1707 as a direction to a suspected trouble area, not a confirmed failed sensor or tire. On Nissan systems, a wrong sensor registration can make the left rear “look” low even when the actual left rear tire reads fine. Always prove the tire pressure with a gauge first, then prove the module’s inputs with data consistency checks and a relearn verification.

Possible Fixes

• Correct tire inflation and verify placard pressure: Set the left rear pressure accurately, then confirm the scan tool data updates and the code stays cleared.
• Repair the air leak: Replace the valve core, service the bead seal, patch/plug the tire, or repair/replace the wheel as confirmed by leak testing.
• Perform TPMS sensor registration/relearn: Correct sensor ID mapping when the scan tool shows a mismatch or unregistered transmitter condition.
• Repair wiring, grounds, or connectors for the Air pressure monitor: Restore clean power and low-resistance grounds after voltage-drop testing confirms a supply issue.
• Replace the TPMS sensor only after verification: Replace the left rear sensor when gauge pressure stays correct but the sensor data remains inaccurate or intermittent after relearn and circuit checks.

Can I Still Drive With C1707?

You can usually drive the Nissan Leaf with C1707, but treat it as a tire safety issue first. This code means the Air pressure monitor sees low pressure at the left rear. Low tire pressure increases heat and flex in the sidewall. That raises the risk of poor handling, longer stopping distance, and tire damage. If the tire looks visibly low, pulls, or the TPMS warning stays on, stop and check pressure before highway driving. Inflate to the door-jamb specification and recheck for a leak. Do not rely on the dash warning alone if ambient temperatures change.

How Serious Is This Code?

C1707 ranges from minor to urgent based on the actual tire pressure. When the tire only dropped slightly due to temperature, this code mostly creates a warning and a reset requirement. When the left rear tire lost air from a puncture, bead leak, or valve stem leak, this becomes a safety concern. Handling changes can appear fast during braking or corners. Tire damage can also occur if you drive it underinflated for long. This code does not point to an engine or high-voltage drivability fault on the Leaf. It points to a chassis safety condition that you must verify with a gauge.

Common Misdiagnoses

Technicians often replace the left rear TPMS sensor immediately because the scan tool displays “low pressure.” That skips the first requirement: confirm real pressure with a calibrated gauge. Another common mistake involves inflating the tire and clearing codes, then declaring it fixed without checking for a slow leak. Shops also misdiagnose a relearn issue as a failed sensor after tire rotation. If the Leaf did not auto-learn positions, the Air pressure monitor may label the corner differently than expected. Avoid wasted parts by confirming sensor data, checking for leaks, and verifying the module sees the corrected pressure during a drive.

Most Likely Fix

The most frequent confirmed repair direction involves correcting the actual left rear tire pressure and repairing the air loss source. That may mean patching a puncture, resealing a bead, or replacing a leaking valve core or service kit. If pressure stays stable but the code returns, focus on confirmation steps before parts. Verify the sensor reports plausible pressure and temperature, then inspect the sensor, valve stem area, and wheel well for damage. Confirm the Air pressure monitor receives the updated value after a short drive, since the system may not update instantly at idle.

Repair Costs

Repair cost depends on whether the confirmed root cause is wiring, connector condition, a sensor, a module, or the labor needed to diagnose the fault correctly.

Last updated: April 10, 2026

Definition source: Nissan factory description · Autel MaxiSys Ultra & EV. Diagnostic guidance is based on factory-defined fault logic for this code.