P1600 Scion Code - ECM BATT Malfunction
Quick Answer
Battery positive voltage is supplied to terminal BATT of the Engine Control Module (ECM) even when the ignition switch is OFF for use by the Diagnostic Trouble Code (DTC) memory and air–fuel ratio adaptive control value memory, etc. Common causes include Open in back up power source circuit, Faulty Engine Control Module (ECM), Engine Control Module (ECM) harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1600 Scion indicates ECM BATT Malfunction.
- Common causes
- Common causes include Open in back up power source circuit, Faulty Engine Control Module (ECM), Engine Control Module (ECM) harness is open or shorted.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1600 Scion Description
What are the Possible Causes of the DTC P1600 Scion?
- Open in back up power source circuit
- Faulty Engine Control Module (ECM)
- Engine Control Module (ECM) harness is open or shorted
- Engine Control Module (ECM) circuit poor electrical connection
How to Fix the DTC P1600 Scion?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1600 Scion code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P1600 Scion Code
1. What does the OBDII code P1600 mean on a Scion?
P1600 indicates an ECM BATT Malfunction, meaning there’s an issue with the battery backup power supply to the Engine Control Module (ECM).
2. What are the common symptoms of code P1600 in a Scion?
Symptoms may include difficulty starting the engine, loss of stored settings like radio presets, the check engine light turning on, and possible issues with vehicle performance.
3. What causes the P1600 code to appear in a Scion?
Common causes include a weak or dead vehicle battery, corroded or loose battery terminals, a blown ECM backup fuse, or wiring issues in the ECM power circuit.
4. Can a bad ECM cause the P1600 code?
Yes, though less common, a faulty ECM can cause this code if it fails to retain power or has internal circuit damage.
5. How do I fix the P1600 code in my Scion?
Start by checking the vehicle battery’s condition and charging it if needed. Inspect and clean the battery terminals, check the ECM backup fuse, and look for damaged wiring or poor connections.
6. Can driving with the P1600 code cause further damage?
While the vehicle may still run, ignoring the code can lead to further electrical issues or loss of critical ECM functionality, potentially causing the car to stall or fail to start.
7. How do I check the ECM backup fuse for the P1600 code?
Locate the fuse box, find the ECM backup fuse using the diagram, and inspect it for damage or breaks. Replace it if necessary with the correct amperage fuse.
8. Does a weak alternator cause the P1600 code in a Scion?
Yes, a weak alternator can indirectly contribute to this code by not properly charging the battery, leading to insufficient power to the ECM.
9. Do I need to replace the ECM if I get the P1600 code?
Not necessarily. Replacing the ECM is a last resort after ruling out issues with the battery, wiring, and backup fuse.
10. How can I prevent the P1600 code from recurring in my Scion?
Maintain a healthy battery, keep battery terminals clean and secure, check fuses periodically, and ensure the alternator is functioning properly.
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