my Ram 1500 DT (2019-Present) won’t stay running when it’s cold outside, why?

Ram 1500 DT (2019-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

529 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix engine stalling issues in cold weather for the 2019 Ram 1500 DT. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before working on the cooling system to avoid burns.

Symptoms

•Engine stalls shortly after starting
•Rough idle when the engine is cold
•Check engine light illuminated
•Difficulty starting in cold temperatures
•Increased emissions at startup

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any related fault codes.
2
Inspect the battery condition and voltage to ensure it provides sufficient power.
3
Check the engine coolant temperature sensor for proper operation.
4
Test the fuel pressure to confirm adequate fuel delivery.
5
Inspect the air intake system for blockages or leaks.
6
Examine the throttle body for carbon buildup or obstruction.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Multimeter
•Fuel pressure gauge
•Socket set
•Throttle body cleaner
•Soft brush

Parts Required

•Engine coolant temperature sensor
•Fuel filter (if applicable)
•Battery (if necessary)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any related fault codes.
2
Inspect the battery condition and voltage to ensure it provides sufficient power.
3
Check the engine coolant temperature sensor for proper operation.
4
Test the fuel pressure to confirm adequate fuel delivery.
5
Inspect the air intake system for blockages or leaks.
6
Examine the throttle body for carbon buildup or obstruction.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a flat surface and the engine is off.
Disconnect the battery to prevent electrical shorts.

2. Battery Inspection

Use a multimeter to measure battery voltage; it should be at least 12.6 volts.
If the battery is weak, replace it with a new one.
Reconnect the battery after replacement.

3. Engine Coolant Temperature Sensor Replacement

Locate the engine coolant temperature sensor (usually near the thermostat housing).
Disconnect the electrical connector from the sensor.
Remove the sensor using a socket or wrench; be prepared for coolant spillage.
Install the new sensor and reconnect the electrical connector.
Ensure the coolant level is topped off after the installation.

4. Fuel System Check

Use a fuel pressure gauge to connect to the fuel rail service port.
Start the engine and observe the pressure; it should meet manufacturer specifications (typically around 58-65 psi for Ram 1500).
If pressure is low, check the fuel pump and filter for issues; replace as necessary.

5. Throttle Body Cleaning

Remove the intake duct to access the throttle body.
Spray throttle body cleaner onto a clean rag or directly onto the throttle body.
Use a soft brush to clean any carbon buildup; do not use metal tools.
Reattach the intake duct and ensure all clamps are secured.