P1106
ChryslerDual Alternator Lower Fault/ Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent High Voltage
Medium SeverityThe P1106 code indicates an issue with either the dual alternator system or an intermittent high voltage signal from the Manifold Absolute Pressure (MAP) sensor. This can lead to engine performance problems, reduced fuel economy, or issues with the vehicle's charging system.
⚠️ Before You Begin (Safety First)
Always ensure the vehicle is safely parked and turned off before performing any inspections or repairs. When working with electrical components or the charging system, always disconnect the battery's negative terminal to prevent electrical shock or damage to the vehicle's electronics. Allow the engine to cool before touching engine components.
Common Symptoms
- Check Engine Light illuminated
- Rough idling or stumbling engine
- Engine hesitation or lack of power during acceleration
- Decreased fuel economy
- Engine stalling
- Charging system warning light (if related to alternator fault)
- Poor engine performance
Common Causes
- Faulty Manifold Absolute Pressure (MAP) sensor
- Damaged, corroded, or loose wiring/connector for the MAP sensor circuit
- Vacuum leaks affecting MAP sensor readings
- Faulty lower alternator in a dual alternator system
- Issues with the alternator's wiring or voltage regulator
- Less commonly, a problem with the Powertrain Control Module (PCM)
Frequently reported on: Chrysler Town & Country 2001-2007, Dodge Grand Caravan 2001-2007, Dodge Ram 2500 2003-2009, Dodge Ram 3500 2003-2009
Diagnostic Steps
- Safely park the vehicle and disconnect the negative terminal of the battery.
- Locate the MAP sensor (typically on the intake manifold) and inspect its electrical connector for any corrosion, bent pins, or loose connections.
- Carefully inspect the wiring harness leading to the MAP sensor for any signs of fraying, cuts, or damage.
- If possible, remove the MAP sensor and clean its sensing element with a specialized sensor cleaner, avoiding harsh chemicals.
- Reconnect the MAP sensor and its electrical connector, ensuring a snug fit.
- If your vehicle has a dual alternator system, visually inspect the lower alternator for any obvious damage or loose connections.
- Reconnect the battery and clear the P1106 code using an OBD-II scanner. Start the vehicle and observe if the code returns.
- If the code persists, you may consider replacing the MAP sensor as it is a common failure point for this code.
- For dual alternator issues, check battery voltage and alternator output using a multimeter if you have the proper tools and knowledge.
👨🔧 When to Call a Professional
If basic checks of the MAP sensor and its wiring do not resolve the issue, or if the code points to a dual alternator fault, especially if charging system warnings are present, it is best to seek professional diagnosis. Alternator replacement or advanced electrical troubleshooting often requires specialized tools and expertise.
Commonly Asked Questions
What does the P1106 code specifically mean for a Chrysler vehicle?
The P1106 code for Chrysler indicates either a problem with the lower alternator in a dual alternator system or an intermittent high voltage condition in the Manifold Absolute Pressure (MAP) sensor circuit.
What are the common symptoms of a P1106 code?
Common symptoms include an illuminated Check Engine Light, rough idling, engine hesitation or stalling, decreased fuel efficiency, and potentially charging system warning lights if related to the alternator.
Can I diagnose P1106 myself?
Yes, you can start by inspecting the MAP sensor and its wiring for damage or loose connections, and checking the MAP sensor's voltage output. If your vehicle has a dual alternator system, you should also check the charging system's voltage.
Is it safe to drive with a P1106 code?
Driving with this code is not recommended for extended periods. While it might seem minor, it can lead to poor engine performance, increased emissions, and if it's an alternator issue, could eventually cause the vehicle to lose electrical power and stall.
What is typically the first step to fix a P1106 code?
The most common first step is to inspect the MAP sensor and its electrical connector for any visible damage, corrosion, or loose connections. Often, cleaning or replacing the MAP sensor can resolve the issue if it's sensor-related.