C1705 – Low pressure (right front) (Nissan)

Nissan-specific code — factory diagnostic data

C1705 means the Nissan Leaf has detected low tire pressure at the right front. You will usually see a tire pressure warning and the car may feel softer or less stable. According to Nissan factory diagnostic data, this manufacturer-specific code indicates “Low pressure (right front)” in the Air pressure monitor system. This code does not prove a failed sensor. It tells you the module believes the right-front pressure is below its expected range or the reported value is not plausible. Confirm the actual tire pressure first. Then verify the sensor signal and module inputs before replacing parts.

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C1705 Quick Answer

C1705 on Nissan indicates the Air pressure monitor flagged low pressure at the right-front tire. Inflate to the placard specification and confirm the sensor reports correctly before condemning any TPMS component.

What Does C1705 Mean?

Official definition: “Low pressure (right front).” In plain terms, the Air pressure monitor believes the right-front tire pressure is too low. In practice, that means you should treat it as a safety and tire-damage risk until you verify the tire’s cold pressure with a reliable gauge.

What the module checks: The Air pressure monitor does not “see” the tire directly. It evaluates the right-front pressure value reported by the tire pressure sensor and compares it to expected operating limits and plausibility rules. Why that matters: a true underinflation, a slow leak, a sensor reporting an incorrect low value, or a receiver/communication issue can all point the module toward the same “low pressure” trouble area. Use testing to separate an actual low tire from a reporting problem.

Theory of Operation

Under normal conditions, each wheel’s tire pressure sensor measures pressure and temperature. The sensor transmits that data by radio. The Nissan Leaf’s Air pressure monitor receives and processes the message. It then decides if pressure stays within its acceptable range for normal driving.

This specific code sets when the module judges the right-front pressure value as low. That can happen from real underinflation, rapid pressure loss, or a sensor value that trends low compared to reality. A weak sensor battery or intermittent reception can also distort the reading. The key is to verify the physical pressure first, then verify that the module receives a stable, plausible signal.

Symptoms

Drivers and technicians typically notice one or more of these symptoms with C1705:

• Warning light TPMS/low tire pressure warning illuminates and may stay on.
• Handling change Vehicle feels less responsive, especially during turns or braking.
• Tire appearance Right-front tire looks lower than the others or shows sidewall bulge.
• Ride quality Increased harshness or “thump” over bumps from low pressure.
• Pulling Vehicle drifts or pulls due to uneven rolling resistance.
• Tire temperature Right-front tire runs hotter after driving, especially if very low.
• Scan data Live data shows the right-front pressure lower than the other tires.

Common Causes

• Actual right-front tire pressure low: A true low-pressure condition triggers the Air pressure monitor to set a low-pressure fault for that wheel position.
• Slow leak at valve core or bead seal: A small leak drops pressure over hours or days and repeatedly re-triggers the code after resets.
• Tire damage or puncture: A nail or sidewall injury can bleed pressure fast enough to set the code during a single drive.
• Seasonal temperature drop or rapid ambient change: Lower air temperature reduces tire pressure and can push a marginal tire below the warning threshold.
• TPMS sensor ID not learned or wrong wheel ID mapped: If the Air pressure monitor associates the wrong ID to the right-front position, it can flag “right front” while the low tire sits elsewhere.
• Weak or failing TPMS sensor battery: Low sensor power can cause dropouts or invalid updates that the module interprets as a low-pressure concern during its plausibility checks.
• RF interference or poor reception at the receiver/module: Interference or a reception issue can corrupt the pressure data stream and lead to a false low-pressure message.
• Connector or harness issue at the Air pressure monitor/receiver: High resistance, corrosion, or a loose connector can degrade reception or module operation and trigger incorrect pressure reporting.

Diagnosis Steps

Use a scan tool that accesses Nissan TPMS/Air pressure monitor data, plus a quality tire pressure gauge. Have a regulated air source, so you can correct pressure accurately. A DVOM helps with power and ground checks at the module. Use service information for connector locations and ID learn procedures, since Nissan platform details vary.

1. Confirm C1705 in the Air pressure monitor and record freeze frame data. Focus on ignition state, battery voltage, vehicle speed, and any related TPMS codes. Freeze frame shows the conditions when the fault set. Use a scan-tool snapshot during a road test if the issue acts intermittent.
2. Check the right-front tire pressure with a known accurate gauge before any electrical work. Compare it to the placard specification and the other three tires. If pressure is low, correct it and inspect for an obvious puncture or sidewall damage.
3. Inspect the right-front valve stem, cap, and valve core for leakage. Use soapy water at the valve core and around the bead. Repair the leak source and recheck pressure stability.
4. Verify the warning behavior and DTC status after correction. Clear the code and cycle the ignition, then recheck for a pending versus confirmed/stored DTC. Many warnings require the fault to appear on consecutive drive cycles before a confirmed code returns.
5. Use the scan tool to view live TPMS data for all wheels. Compare the reported right-front pressure, temperature, and update behavior to the other tires. Look for a sensor that fails to update, jumps erratically, or reports a value that does not match the gauge.
6. If the right-front tire pressure matches the gauge but the scan tool still flags “right front,” verify wheel ID registration and position mapping. Follow Nissan’s relearn procedure exactly. Confirm the Air pressure monitor shows the correct sensor ID assigned to the right-front position.
7. Check fuses and power distribution for the Air pressure monitor/receiver circuit before probing the module. Confirm each related fuse carries load and has clean terminals. Do not rely on visual inspection alone.
8. Verify Air pressure monitor power and ground with voltage-drop tests under load. Backprobe at the module connector with the circuit operating. Keep ground drop under 0.1 V. A high-resistance ground can pass a continuity test and still fail under load.
9. Inspect the Air pressure monitor connector and harness routing. Look for water intrusion, spread terminals, corrosion, and pin fit problems. Pay attention to areas near kick panels, under-seat routing, or any recent body work zones.
10. If live data shows sensor dropouts, test drive and capture a scan-tool snapshot. Trigger the snapshot when the warning appears or when the right-front data stops updating. Use that timestamp to correlate speed, battery voltage, and receiver status to the dropout.
11. After repairs, clear codes and perform a verification drive. Confirm the Air pressure monitor displays stable right-front updates and no C1705 returns as pending or confirmed. Recheck tire pressure after the drive to confirm it holds.

Professional tip: Do not condemn a TPMS sensor because the code says “low pressure.” Prove the pressure mismatch first with a gauge, then prove the data path with live data. When pressure and scan data disagree, suspect ID mapping, reception, or module power/ground before you replace parts.

Possible Fixes

• Set tire pressure to specification and verify retention: Correct the right-front pressure and confirm it holds after a drive and a cold soak.
• Repair the air leak: Replace the valve core, reseal the bead, or repair/replace the tire based on leak location and safety.
• Perform TPMS ID relearn and position registration: Re-register the correct sensor ID to the right-front position using the Nissan-approved procedure.
• Repair wiring/connector issues at the Air pressure monitor: Clean corrosion, restore terminal tension, and repair damaged harness sections after you verify voltage-drop faults.
• Replace a verified failing TPMS sensor: Replace the right-front sensor only after you confirm weak transmission, no updates, or incorrect readings with correct ID mapping.
• Repair or replace the Air pressure monitor/receiver if proven: Replace the module only after you confirm correct power/ground, good wiring, correct IDs, and persistent false reporting.

Can I Still Drive With C1705?

You can usually drive the Nissan Leaf with C1705, but you should treat it as a tire-safety alert. This manufacturer-specific code means the Air pressure monitor reports low pressure at the right front. Low inflation changes handling and increases stopping distance. It also raises tire temperature and failure risk at highway speed. Drive conservatively and avoid hard cornering or heavy loads until you verify pressure with a quality gauge. Inflate to the placard specification, not the sidewall. If the tire drops again soon, stop and inspect for a puncture or bead leak. Do not rely on the warning alone to judge tire condition.

How Serious Is This Code?

C1705 ranges from an inconvenience to a real safety issue. It stays minor when the tire only fell slightly from a temperature change and holds pressure after adjustment. The risk climbs fast when the tire loses pressure repeatedly or quickly. Underinflation can trigger poor steering response, longer braking, and tire damage. It can also affect traction and stability behavior since those systems assume proper tire grip. The code does not prove a failed sensor. Per SAE J2012 guidance, the DTC points to a suspected area only. Confirm actual tire pressure first, then confirm the sensor signal and module inputs before you plan any parts.

Common Misdiagnoses

Technicians often replace the right-front TPMS sensor immediately because the code names a corner. That wastes time when the tire simply leaked or someone inflated it wrong. Another common error involves using shop air-line gauges that read low, then “correcting” pressure into an underinflated state. Some shops also clear codes without verifying that the Air pressure monitor receives updated pressure data afterward. That leads to repeat comebacks. Another trap involves ignoring wheel swaps or rotations. The Leaf may need a relearn procedure so the module maps the correct sensor ID to the right-front position. Finally, people blame the module when the real issue comes from sensor damage, corrosion at the valve stem, or a slow tread puncture.

Most Likely Fix

The most common confirmed repair direction involves correcting the actual tire pressure and repairing the leak source. That can mean a puncture repair, bead reseal, or valve core service after you verify the tire holds pressure. The next frequent direction involves completing the Nissan TPMS relearn and verifying sensor data updates in the Air pressure monitor after a rotation or wheel change. Do not call a sensor “bad” until you confirm the tire holds correct pressure and the scan tool shows the right-front sensor reports plausibly and updates during a short drive.

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.