The grid heater on your Ram Cummins is a small component with a big job — it heats the intake air charge before startup, helping your diesel fire cleanly in cold weather and reducing white smoke on initial startup. When it fails, you'll notice rough cold starts, excessive cranking, white smoke that doesn't clear, or in severe cases a no-start condition. At ProTech Diesel Center in Kamloops, we see grid heater failures regularly — and what's behind most of them will surprise you.
What Does the Grid Heater Actually Do?
The grid heater is an electric heating element mounted in the intake tract. When you turn the key to the run position, it activates for a set time before cranking to warm the air entering the cylinders — critical on cold BC mornings.
How Grid Heater Failures Happen
The most common cause is not the heating element itself — it's the hardware holding it in place. Over time, mounting bolts corrode, loosen, or fail entirely. When the connection becomes intermittent or the element physically fails, the system stops providing intake heat.
Signs Your Grid Heater Is Failing
- White smoke on cold starts that takes a long time to clear
- Extended crank time before the engine fires
- Rough idle for the first few minutes after startup
- Check engine codes related to the grid heater circuit
- No-start condition in cold weather (severe failure)
The Fix
Depending on what we find, the repair could be as simple as replacing corroded hardware and cleaning the connections, or it might require a new grid heater element and relay. At ProTech Diesel in Kamloops, we do a full intake and cold-start system inspection — not just a code pull.
Frequently Asked Questions
Q: Which Ram Cummins trucks are most affected?
A: Most often 2007–2019 Ram 6.7L Cummins trucks, but any high-mileage Ram diesel is worth inspecting.
Q: Can I drive with a failed grid heater?
A: In warm weather yes. In cold BC winters, get it fixed — it causes engine wear from incomplete cold starts.
Q: How much does repair cost at ProTech Diesel in Kamloops?
A: Hardware replacement is inexpensive. If the element and relay need replacing it's more involved. Call us for a quote.
Q: Will fixing it stop my white smoke?
A: If the grid heater is the root cause, yes. If white smoke persists after repair, we'd look at injectors or coolant issues.
Q: Is this related to the Monster-Ram upgrade?
A: Different systems, but complementary. We typically recommend addressing the grid heater first, then evaluating the Monster-Ram.