P1107
NissanP1107 indicates either a malfunction in the lower circuit of the dual alternator system or an intermittent low voltage condition in the Manifold Absolute Pressure (MAP) sensor circuit, specific to Nissan vehicles.
Medium SeverityThis code means your Nissan's dual alternator system might have an electrical problem in its lower circuit, or the Manifold Absolute Pressure (MAP) sensor is sending intermittent low voltage signals. This can lead to charging system issues, affecting electrical accessories and battery health, or engine performance problems like rough idle, poor fuel economy, and reduced power.
⚠️ Before You Begin (Safety First)
Always disconnect the negative battery terminal before working on electrical components. Be cautious when working near moving engine parts or hot surfaces. If the alternator is not charging, the vehicle may stall unexpectedly.
Common Symptoms
- Check Engine Light illumination
- Battery warning light on dashboard
- Dim headlights or interior lights
- Slow cranking or no-start condition
- Engine running rough or stalling
- Poor acceleration or reduced engine power
- Decreased fuel efficiency
Common Causes
- Faulty lower circuit wiring or connections in the dual alternator system
- Defective dual alternator
- Failed Manifold Absolute Pressure (MAP) sensor
- Corroded or loose MAP sensor wiring or connector
- Vacuum leak affecting MAP sensor readings
- Engine Control Module (ECM) fault (less common)
Frequently reported on: Nissan Titan (2004-2015), Nissan Armada (2004-2015), Nissan Frontier (2005-2019), Nissan Pathfinder (2005-2012), Nissan Xterra (2005-2015)
Diagnostic Steps
- Inspect the battery and charging system for proper voltage and charge.
- Visually inspect the wiring and connectors related to the alternators and the MAP sensor for any signs of damage, corrosion, or looseness.
- Check for vacuum leaks around the intake manifold that could affect MAP sensor readings.
- If possible, use a multimeter to test the voltage at the MAP sensor connector according to your vehicle's service manual.
- If equipped, test the output of both alternators to ensure they are charging correctly.
- Consider replacing the MAP sensor if it tests faulty or if other checks yield no issues.
👨🔧 When to Call a Professional
If after basic checks the charging system or engine performance issues persist, or if you suspect complex wiring problems within the dual alternator system, it's best to consult a professional Nissan technician for diagnosis.
Commonly Asked Questions
What is a dual alternator system?
A dual alternator system uses two alternators to provide more electrical power, typically found in vehicles with high electrical demands, like heavy-duty trucks or SUVs.
Can a P1107 code be caused by a bad battery?
While a bad battery can cause charging issues, P1107 specifically points to an alternator circuit or MAP sensor issue. However, a faulty charging system can damage a battery over time, so checking the battery is a good first step.
Where is the MAP sensor located on a Nissan?
The MAP sensor is typically located on the intake manifold of the engine or connected to it via a vacuum hose. Its exact location can vary by Nissan model and engine type.
Will P1107 prevent my Nissan from starting?
If the dual alternator malfunction leads to a completely discharged battery, then yes, it can prevent your vehicle from starting. A MAP sensor issue is less likely to prevent starting but can cause rough running.
Is it safe to drive with a P1107 code?
It depends on the underlying issue. If it's a minor MAP sensor issue, you might experience reduced performance. If it's a severe alternator problem, your battery could drain, leading to a sudden loss of power and vehicle stall, which is unsafe. It's best to diagnose and repair it promptly.