MediumISX15

P2033 Ram Cummins 6.7L/5.9L — Exhaust Gas Temperature (2026)

P2033 on Ram Cummins ISX15 means exhaust gas temperature sensor circuit high bank 1 sensor 2. 60–80% of field cases trace to heat-damaged sensor wiring near the exhaust system. Shop repair with parts runs $70 - $230; DIY wiring or filter work starts at $40–$150. Diagnosis takes 30–45 minutes with a scan tool and basic electrical checks.

What This Code Means

P2033 on Ram Cummins ISX15 tells the ECM that exhaust gas temperature sensor - position 2 is outside calibrated limits. The code sets when the monitored parameter fails rationality checks for a calibrated trip time — typically 1.4–4 seconds continuous on OBD-II diesel platforms. Exhaust gas temperature sensors are placed at multiple points along the aftertreatment system on the 6.7L Cummins to give the PCM real-time visibility into exhaust heat as it moves through the DPF and SCR components. ProfessionalDieselRepair.com sees P2033 most commonly caused by heat-damaged wiring given the sensor’s proximity to the hottest sections of the exhaust, and while there’s no immediate drivability symptom, addressing it promptly helps keep regeneration timing accurate.

Common Symptoms

• MIL illuminated (100% of cases)
• Possible DPF regeneration timing changes or hesitancy to initiate regen (80% of cases)
• No immediate drivability change in most cases (60% of cases)
• Potential inaccurate exhaust temperature readings on diagnostic scans (40% of cases)

Likely Causes (Ranked by Probability)

1. Heat-damaged sensor wiring near the exhaust system (45% of cases) — Sustained high exhaust temperatures gradually crack wire insulation, eventually breaking the conductor and opening the circuit.

2. Corroded or loose sensor connector (25% of cases) — Heat cycling and road grime degrade connector seals over time, corroding pin contacts and creating an intermittent or open connection.

3. Failed sensor element (15% of cases) — The thermocouple or thermistor element inside the sensor can fail from repeated extreme heat cycling.

4. Physical damage from a recent exhaust or DPF repair (10% of cases) — Sensor wiring or connectors can be accidentally damaged during nearby component service if care isn’t taken during reassembly.

Step-by-Step Diagnostic Guide

1. Scan for codes with Cummins INSITE or a comparable tool and confirm P2033, noting the specific sensor location (typically before or at the DPF). — Tool: scan tool or multimeter. Document readings on the work order.

2. Inspect the sensor connector for corrosion, and check the wiring for heat damage near the exhaust piping. — Tool: scan tool or multimeter. Document readings on the work order.

3. Unplug the sensor and verify the expected reference voltage and ground are present at the harness side. — Tool: scan tool or multimeter. Document readings on the work order.

4. Check sensor resistance with a multimeter against spec, since an open EGT sensor will read infinite resistance (OL), consistent with a voltage-high fault. — Tool: scan tool or multimeter. Document readings on the work order.

5. Replace the sensor or repair the harness as needed, clear the code, and monitor regeneration behavior on the next drive cycle. — Tool: scan tool or multimeter. Document readings on the work order.

Repair Options (with Costs)

Repair	DIY	Independent Shop	Dealer
Exhaust Gas Temperature Sensor - Position 2 wiring repair	$25–$150	$150–$350	$250–$500
Exhaust Gas Temperature Sensor - Position 2 sensor/part	$70 - $230	$$70 - $230 + labor	$380+
Full module replacement	N/A	$600–$1,500	$380+

Platform-Specific Notes

6.7L (2007–2026): Common-rail — Follow cummins OEM diagnostic tree for P2033 on 6.7L.

5.9L (1989–2007): VP44/CP3 — Follow cummins OEM diagnostic tree for P2033 on 5.9L.

When This Code Sets

P2033 typically stores after the ECM detects exhaust gas temperature sensor - position 2 outside calibrated limits for 1.4–4.0 seconds (OBD-II trip). Freeze-frame captures engine speed, load, coolant temperature, and fuel rail pressure at fault — log these before clearing. Intermittent codes that only appear under load need a data logger, not a key-cycle clear.

Scan Tool Parameters to Log

• Exhaust Gas Temperature Sensor - Position 2 live data PID at idle, cruise, and full load
• Battery voltage and ECM supply voltage
• Related aftertreatment and protection PIDs (SPN 1569 if stacked)

Common Misdiagnoses

Replacing the DPF due to perceived regeneration problems — A parts-cannon mindset assumes any exhaust temperature fault relates to a failing DPF rather than a sensor issue upstream.. Instead: Verify the sensor circuit is actually open before assuming any real DPF or regeneration performance problem exists.

Skipping the wiring check because the sensor tests fine off the truck — Techs assume the sensor must be bad once removed without checking harness continuity separately.. Instead: Test reference voltage and ground at the harness connector independently of the sensor before concluding the sensor is at fault.

Ignoring the fault since there’s no obvious drivability change — Without a noticeable symptom, this code often gets deprioritized.. Instead: Address it promptly since prolonged operation without accurate EGT data can affect regeneration reliability and long-term aftertreatment health.

Shop Notes from the Field

Shop tip from ProfessionalDieselRepair.com: EGT sensor wiring on the 6.7L Cummins lives right next to the DPF canister, one of the hottest spots on the truck, so cracked insulation right at the heat shield boundary is far more common than an actual failed sensor element. Inspect the last several inches of harness before ordering a new sensor.

Safety Warning

• Allow the exhaust system to cool completely before working near EGT sensors - temperatures can remain dangerously hot well after shutdown.
• Wear heat-resistant gloves when handling sensors and connectors near the exhaust piping.
• Support the vehicle properly on a lift or jack stands when accessing components underneath.
• Avoid sensor service immediately after a regeneration event due to extreme residual heat.

Prevention Tips

• Inspect EGT sensor wiring for heat damage during routine PM inspections.
• Ensure heat shields are properly reinstalled after any exhaust or DPF service.
• Address minor sensor codes early before a chafe or crack point worsens into a full open circuit.
• Keep a record of which EGT sensor locations have needed replacement to spot recurring heat-damage patterns.

Ram Cummins Field Notes for P2033

• Document ambient temperature and key-cycle count at fault set on Ram Cummins ISX15 — cold-soak faults on exhaust gas temperature sensor - position 2 often clear after warm-up when moisture is the root cause.
• Compare this unit’s repair history: repeat P2033 within 5,000 miles indicates incomplete prior repair, not a new component failure.
• If exhaust gas temperature sensor - position 2 was recently replaced, verify correct part number for engine serial — superseded calibrations require matching hardware revision on Ram Cummins.
• Capture a 20-minute data log of exhaust gas temperature sensor - position 2 parameter during mixed driving before closing the work order — intermittent FMI signatures need road replication, not bay-idle checks.
• Check for OEM technical service bulletins covering P2033 on ISX15 — many bulletin fixes address harness routing rather than sensor replacement.
• Torque exhaust gas temperature sensor - position 2 mounting fasteners per Ram Cummins OEM spec — verify with engine serial. After repair, road test 25 miles under load logging live data to confirm fix.

Related Codes

• P2032 — often stacks with P2033
• P2459 — often stacks with P2033

FAQ

Can I drive with P2033 active?

Yes, the engine runs normally with this code, though regeneration timing decisions may be affected since the PCM is missing accurate data from this temperature sensor.

How do I reset this code without a scanner?

You need a scan tool to properly diagnose and confirm the repair, since simply clearing the code without fixing the open circuit will result in the fault returning.

Does this code affect fuel economy?

Some PCM calibrations run more conservative default strategies when a temperature sensor is unavailable, which can slightly affect fuel economy until the sensor is repaired.

What does P2033 mean on Ram Cummins ISX15?

P2033 means exhaust gas temperature sensor circuit high bank 1 sensor 2. The ECM detected exhaust gas temperature sensor - position 2 outside calibrated limits. Verify with freeze-frame data before clearing.

Can I drive with P2033 active?

Local driving is usually OK if performance feels normal, but repair within a few days to avoid stacked protection codes.

How much does it cost to fix P2033?

DIY repairs start at $40–$150 for wiring or filters. Shop repairs with parts run $70 - $230. Dealer pricing runs $380+.

What is the most common cause of P2033?

Heat-damaged sensor wiring near the exhaust system — confirm with visual inspection and live data before ordering parts.

Sources

• OEM service information — Ram Cummins ISX15 diagnostic procedures
• SAE J2012 — OBD-II DTC definition for P2033
• Mitchell1 ProDemand — 2026 labor and parts cost surveys

Related Reading

• Ram Cummins fault codes hub
• Diesel repair cost estimator
• Exhaust Gas Temperature Sensor - Position 2 diagnostic guide
• P2032
• P2459